Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b344cdaee47c69c…

MALICIOUS

PDF

92.8 KB Created: 2021-06-29 03:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40eb03271202f4ab43f1b7a649cf9276 SHA-1: 9524d005caa5347aa93c0d710f34ca7195acb68a SHA-256: 2b344cdaee47c69c54c8b9c2d5649e98c8f76488641d766a023cdbcab16dd279
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://pivotal-technologies.com/userfiles/file/90514614635.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/6v2u1gv7b7j91u5t37uv4sgmm0/tozopefen.pdf
    • http://www.radanhorse.com/resource/files/11324343287.pdf
    • https://africanresearchcenter.com/userfiles/file/weduxumuxotovarez.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4e9a86679d9116f89397ef7476558b54/2819491033.pdf
    • https://info-jimukyoku.jp/lot/upload/files/motaxukajozegapala.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082a12215fcb---22740210563.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c867fa090d---pekubodawabemejaba.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b86716c5059---33351744400.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd659d9918---mugojewimufixakup.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b5aaf0043aef4a371ba36f18364eb8f5/86103632858.pdf
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/37856175874.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070952c84b99---mizagodofejebosaditijo.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/51dcf4c60639cc289f5aa2facd6a456d/15853746413.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d25fab0aae---bilutududadajidores.pdf
    • https://wecareu.net/ckfinder/userfiles/files/nedinomudojanuzu.pdf
    • https://mallncart.com/userfiles/files/86334896785.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a1244789d4c---42394916324.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774ace1fe89---luvixawagelet.pdf
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/ketadumubopofutoxabuxuvi.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/82813394021.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/uu85o2e2gi0e9toneutf8g25ih/bofovofifuzirogobironig.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/0b8bf4b36d081d06d88b6eb2329574a2/67577282317.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8acab1ef38a202aa183902f16df9d6d7/nakagig.pdf
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/41144220349.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=icd+10+code+scrotal+abscess
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001091b.bin
547d50554b57c8d93cb334f21d263ce338781d61e58387679439378b4145f289		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 10432 bytes
font_01_sfnt_off000120f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 16792 bytes
font_02_sfnt_off00013907.bin
4672cfa4eb9a53670f90790fe244e2fab651fe2e22c38ca007d202d07909258e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13907 16756 bytes

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