Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fb44c3ca841d05…

MALICIOUS

PDF

89.3 KB Created: 2021-06-28 23:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec81d50b11003fb4642e6afe56c138da SHA-1: 8cd30b5470201a613714b32e156f46c381097071 SHA-256: c9fb44c3ca841d050b7b50621f45e62ab3f6a532fd4e2168d3ef71be606992be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the PDF structure and URL findings point to a common tactic of using link farms for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://longarmacademy.net/fckeditor/userfiles/file/54249199532.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/bmq1f30r975i1ebd8pdb2uihi5/87785070639.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3c4932cc38ddc5a7b66a55dafe92cac9/wejobebejiborapipima.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085664b15269---13881975181.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/3al6hpeec3hvt8jsfa1rgpdbmc/kosizifajonamodobozidutu.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/97c7121e6bfb91d779add7befa5c2bef/65177249132.pdf
    • https://airbays.com/userfiles/file/tonugusuni.pdf
    • http://on-video.com/movies/movie_data/file/14877523114.pdf
    • http://reguitti-engineering.it/userfiles/files/lokapufasibigazix.pdf
    • http://svsteinfurth.de/radsportfiles/file/papigon.pdf
    • http://progfin.pl/userfiles/file/vexiluwudeji.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ba5b01a46ca628ef33f19f61c662c79b/metezemomutovumi.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc7d1748fe---42920604760.pdf
    • https://residenciasanamaro.es/userfiles/files/18842904026.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/581610aff3725d685af0847743de7346/dojorikajovir.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f9d4013e9ad68f2b256b901e35b4146a/xalazapi.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e8f071256c294eda870768df3cffcb44/valupugugumudivoziku.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a588e25539---90943920142.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/zumuzixubogupexedemekobi.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f5dafcf98475725fa6494a94ff6284f0/borarowamumetufupit.pdf
    • http://anatolianlgs.com/userfiles/file/43447656370.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1db423269---11883461174.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-11/20210611054555408320.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc625a9b67b---ridujav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pulled+ligament+in+foot
    • 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_off0000fe06.bin
55e03e53c27f8818ce0b08d599a1927adb6c6a8c8b72fd73628b6a5966442549
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 10528 bytes
font_01_sfnt_off000115bf.bin
64e410096bc933afbe31fed0258473a756d529daba87280499391b906c1a33a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 16400 bytes
font_02_sfnt_off0001402d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1402D 16792 bytes