Malicious PDF — malware analysis report

Static analysis result for SHA-256 8846c922bde78474…

MALICIOUS

PDF

84.4 KB Created: 2021-06-30 05:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c3787fa505619fb83cc6c5df4f81eec SHA-1: a8113f6f884c2e719eb0062cb8fab9af8eb8d1ec SHA-256: 8846c922bde78474fe26ecd89b9a09fd1e093275e5115a1c95e3667ffa2fd4de
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ag1ilfgq6doqjeee12vencbq06/32493154301.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074a0a38e384---waniwivazovi.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4b526d07755a7197a72e6ceaf5d0f0e4/remerutibosubax.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a8e2480e010e4f8fccf950dc703a7e3c/11543507049.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b57ce005aa5---muvotaba.pdf
    • https://netshopnepal.com/userfiles/file/86689174482.pdf
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/60038641486.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/een6a1fja1rvdos0ikh1eh69m8/77014640162.pdf
    • http://booklandbooks.com/userfiles/file/ridaxepidademinipen.pdf
    • http://chunmianxian.com/upfolder/e/files/20210619215158.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc140c33e4---11261555962.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/19090534269.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ea1c1ef1423cb2bc1d7b9d539b4032f6/rimijesibonujafat.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/cc160a00e13d194684ecbdf1565da6ff/jatim.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed188d5bf---patawixunedexarunewutut.pdf
    • http://poorclarescork.ie/images/gikobafemifu.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/928ce9a68aa1dd7daacb2e62068bcfd5/77339984087.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ad828da7cdc---kosimatitojoxebuvovex.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60a0005561---89599555234.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/rovisekefuxu.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9dcf63020---lamekekukabuve.pdf
    • http://4grd.com/cmsimages/file/99341681618.pdf
    • https://sonarmusic.hu/up_image/file/30035910737.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/642eb46ba2b5a49ace77e9e03aac0e4e/54010289526.pdf
    • https://smilepaper.tw/archive/upload/files/37913331893.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tyler+pawn+shop
    • 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_off0000ea21.bin
29b864b62b1bd9918bcd06abafbec4608a0146a21c80f88ad99bcea6ebde7b08
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 10324 bytes
font_01_sfnt_off00010173.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 16792 bytes
font_02_sfnt_off00011985.bin
59e857f4319104495a8568caf4e86300b67e6eddf32e4fd5874f10e007929c18
pdf-font-stream PDF embedded font (sfnt) at offset 0x11985 16452 bytes