Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee6a283af67f8db…

MALICIOUS

PDF

89.4 KB Created: 2021-06-26 02:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 562c6b5877e7bb61f0742ae211c9032e SHA-1: d343cea3b13eadeb62c7f82ff5248b170c854483 SHA-256: 1ee6a283af67f8dba430b49a159ae547a0e9585fdfa9e2a1e5901d4224e8c2fc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the heuristic firings and URL patterns are highly indicative of a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=9th+class+1.5+exercise PDF link annotation
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a2340097ab7---97111371905.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/98595826242.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/oncrpleqgg902b9225sjos34l9/96469610829.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef2ca54548---sujefejopojukuwufodi.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/467c0acbe5b10635ca1f31d880527d92/13323415059.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7a90cc7f---bumuwumulaluraxes.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/da310242d746896c9451c3399ee89f6d/15260804834.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071fe0a29e7d---47002129879.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7ff6206d9731aaafc285ceebdb7b7daf/12512564998.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786589d7400---66798436701.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/j24f8e96ko4c7reh912mfv53f7/tiparipakajufawusezi.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/bffc7d49c6083a850d349e68de5cf50c/26535569180.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/36e32b88f5c729db071fe14a35c08cbe/5965641300.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/bvs9v1sem44a6mmq4g9q3e5okb/niririwu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bf4a92325576eac35e93d26fb8805ab0/59136502781.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/mck3g9nas0jpel38sg9prvhluk/42268945240.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/wigowakelizukeriwebu.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/87361113824.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe981a0097---lotowufunawufanajosa.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/woronalamolusarunexeketo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hu1ivq87udkjtei4k6s1hdjou4/putimisokunupemuzuna.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/53825227020.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9bf51cb463111e713600e59d98acc692/kilomav.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089726526dc1---4523798786.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d343a2974a27210bfd427f25f6781943/16922094287.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 10528 bytes
SHA-256: 901439822cf330a8498d13d221626b3ff86787c9288b53825a9ebb9705767e11
font_02_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 17884 bytes
SHA-256: b6e2051cf9f4870e011dad71682d681d382d002de43a25355e0d982e5a64d9fb
font_03_sfnt_off000142a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A3 16144 bytes
SHA-256: 5f2a87ed485690ae99dd00ffd3dad57dcaf6de75c4981ecbeeee12bb760f3f7c

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