Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c7cae1ffbaa882…

MALICIOUS

PDF

68.7 KB Created: 2021-09-04 16:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b7c4822ba7cc347811cbca8aa189dd29 SHA-1: c5df97d41571c87942d69e3c11310b94ca9ca2ea SHA-256: 91c7cae1ffbaa8829afcef677d628c9c444e2deea399e551614a0072b201452a
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links on compromised infrastructure is a clear indicator of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/42a05419db500509468d4c4ce9103de8/gasawajixufo.pdf In PDF document text
    • http://faceconnects.com/ci/userfiles/files/gemojutaxufiradisigimu.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/39314564387.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1df9ea5e12d928009b6cb5071a9a7dc7/xiwasupu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73a234a0e1---xilizupofediluwofavodi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521170111988996.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/okcec89tt3bo30634vtn3r3eep/rirerexopumel.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/43389734761.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/busodadutodet.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/80043296607.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210527213621268.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3h62vm6nsjcbk2knec0a13hsc6/32085574943.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/tinos.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/44397412329.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/jiladopap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=simplifying+algebraic+expressions+exponents+worksheetsPDF 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_off0000ad88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59A 14684 bytes
SHA-256: 85cea3f99d7d5b76f6f5c8df3438008472e38428beccf9393f9cddddc92ace57
font_02_sfnt_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 11536 bytes
SHA-256: 3e37e6e36d4607005cf0e060734fea8ddc63d6005273b6125893fc15296e4c35

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