Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d755440230c5580…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 23:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da9c489ab859bcbcc1bcd5210cfe22a4 SHA-1: d90b0418571166d4f6e67790624bca7c6c8cbb31 SHA-256: 7d755440230c5580c23adf24a88899da341ddac69433ef933d88a35e6270d4cb
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://zzquansu.cn/d/files/93662284542.pdf In PDF document text
    • http://ramayafaith.net/clients/64268/File/jikige.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/renam.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/23322004546.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/46c624e8e441010c04bd618eb51a5704/2799474753.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/nojabovavemovo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160777422d87e3---naturijibilufit.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/zafetidanore.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/jozajozuron.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/27468141037.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/42bc80d3a34a938c93a8f2da4bfaadd1/wawikusabugerevowuvasufet.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe05edd9e98---dujafinatunogokowuma.pdfIn PDF document text
    • https://atrax.hr/files/52310847856.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/nevimuxapuxoviwobaset.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae459aabf04---61766739612.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/7vvkc3mo9sq72favdta8rgtg34/46268458275.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/banezejad.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a60ede3093a---kejufopitinoluturowijat.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210630031923.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/71086591538.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608835428c37e---49109842465.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/75366748413.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iimer9u8k5l8bhpfkjoed5a4qr/savometujozema.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390c4cd659---kelaxikoxibizipowifijusox.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/20401132493.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/lulelituzedufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=modulo+art+circular+grid+pdfPDF 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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 10484 bytes
SHA-256: f4c5d87968c3cb5adb0decd9fed60330bad5a431ac0e1793f1c0d204e0cb4efa
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 18276 bytes
SHA-256: b6889a639448fc5c06d2275d7a86b2cfdf4bab607c053171148fd696017a76f4
font_02_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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