Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3e443b4b8f8559…

MALICIOUS

PDF

87.2 KB Created: 2021-08-04 03:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4df261d59dd68096cc61e2496925efc6 SHA-1: 8ce5678254fb436feae47b4ab7bf09b6f5970d60 SHA-256: 9f3e443b4b8f855950a4209123a916a970aeb6b7705f46b375fe7e28c75a7069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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 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://arch.ua/ckfinder/userfiles/files/vedujimatirixidiz.pdf In PDF document text
    • http://diamondsnspurs.com/clients/12200/File/junamutezekokutinumijamuk.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/50454908948.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/11732801312.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d666f02369f---41175992717.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/kutogewetigof.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/50273852750.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/pafepobof.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fb5c687d2---63554673220.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b4bf17261---zuterusaj.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ke8e2t32rkp59638vh21o66ps5/sorovitutipaki.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/92239487332.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/28734731867.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fbc405f708b83dc24f03373ae8c01cc8/ronarop.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d049ac6845b020b360a15a552672b40d/fesodabelixunom.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e58b1e21ee0abf78edad74c3b48aa6e0/mokiruxogesixatexujusime.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/30292406849.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3d44aab2f1dc17943b51a33494578723/17209467803.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/lixevilagoje.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/091e43898a532e3f93df249e519acecb/79623715509.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/94442111560f4b3a24e47d.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/41137289567.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/75570170797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sparknotes+macbeth+act+1+scene+5PDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 10996 bytes
SHA-256: 4d4e31f6a9dd700762bda68b3e926e8e36f8d13785196351aae6932a1e151cd0
font_01_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 16504 bytes
SHA-256: 03b9c6f26c61096c91b4b25e781b0d782ac96bede8f54916c5549a6c9df86c6c
font_02_sfnt_off000135fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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