Malicious PDF — malware analysis report

Static analysis result for SHA-256 5633db8596792217…

MALICIOUS

PDF

93.4 KB Created: 2021-07-09 14:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfa4e0d3f1d9c9aaaaffbcc7a294d7e5 SHA-1: 212dd79d4c1d1e64de3abe96004e80b0410e129a SHA-256: 5633db85967922178470533ee132a5f8d27165dd6071f95c9ed440c5f81eb987
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with several pointing to compromised WordPress upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://banderlogclub.ru/Files/file/60196296201.pdf
    • http://agnieszkapawlik.com/userfiles/file/tawesigodej.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4a53233b---sarifelezuvaw.pdf
    • https://ooo-kenk.ru/userfiles/file/xutozepilovejepij.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/55b8fb9d589f949ece4babaf9069f6e7/mukuzareforu.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/6ee54fd46ecf8707d8a3d5734da0bbc1/1008619676.pdf
    • https://egokituz.org/files/galeria/files/435226686.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608312e731513---25483844626.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/77965722035bdfb8c8d310a24c11fd81/bepatotol.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/forugizegefibatofug.pdf
    • https://xn--8--clcp3bi.xn--p1ai/files/92522355073.pdf
    • https://abe-rdc.com/userfiles/file/giginobimugazajasudodiva.pdf
    • http://limuzine.md/userfiles/file/kudidedoferewilasowa.pdf
    • http://chizclean.ru/files/fck/file/29998734770.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/etc3fskl7qbqsecddiffpqp4l1/juxavosusi.pdf
    • http://tafgambiatours.com/userfiles/file/69288539277.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b9b47388cc9917d984936c54a10e8a8f/10209750498.pdf
    • https://alakharia.com/public_html/userfiles/file/dusewamufutejez.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/e219178aef1a96e7cbc9714cbee62010/41220288653.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/35202389118cb2d640ee0b111a37d386/24583913875.pdf
    • http://beijingxinzhi.com/userfiles/file/20210526130355_795093752.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef3e25806---68180854423.pdf
    • https://allcreaturesinc.com/files/files/kewegoneratiganebuzitema.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befee1578d2---moliginumovabo.pdf
    • http://suachuaspa.com/upload/images-content/files/51082927785.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bmw+k1300gt+owners+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f28d.bin
612f62c8a812fa987ce92e97a496cb06dbb2cb6afb1e9d7c11437552be8ba8ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 17932 bytes
font_01_sfnt_off00012031.bin
97bd1dcf9abaf0d3f1195d5846be2d7ed4d64c46cc8ae17a5200a8693051a81a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 11036 bytes
font_02_sfnt_off00013a07.bin
dc06733fb1b3e8baa4303a7b234726769048d67753183ec25fed266cd0fe6b8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A07 16224 bytes
font_03_sfnt_off00014fd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD0 16792 bytes