Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84f87fc433ede20…

MALICIOUS

PDF

86.5 KB Created: 2021-07-04 10:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 87c1f3b988c90568df368eb0a692be49 SHA-1: 3e76786c6c42aa278c6522eb3747237261e5cb41 SHA-256: a84f87fc433ede20c919944f099786777a6392a820537b3f88d5dc32c11a4361
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, with the primary goal appearing to be phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f039d9640a---jagefirexupu.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rtd0tvp2vrc6rnrjnb0kgsfr0p/rotem.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b450714b0a9---5426539590.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ce9283915c339b15b4f6a9bdeeb42cc3/tomasidil.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/76176107319.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096562bb6786---vofodu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/a0af0bf73b7c5cb62d730d051995b1c5/sefijodikigamukun.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbb23b1fb9---retasivub.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/5c559b12bf9fca7c90a95d323657e4db/sidazureji.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/77555405413.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/3n25egvmkkq5pqcdsho112m3o4/gebumuzibivuxuf.pdfIn PDF document text
    • https://t2sc.me/userfiles/4943787392.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/74b91732b5bb1829b47379c1b8cdebc9/1074331166.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/fedilafugedisizewiwiz.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/renezonurinuxiza.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/4715a03cff51492b0dd97a8b84446aaa/41166337729.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7c348f7012086bc2e74b7c2c432a9b47/xadivexovivemopudelodoga.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/fc63b6e5535f94187b12c4718283e9cb/kamirofuwixasas.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/983a48f6dc90e16b1c2e6aa8e4f9ec77/40940450277.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca76be25c---vopujevanuxibepipusa.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/negifupofopijokib.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/kururaximig.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0d41d5b5ba847472f784079d889eeb2b/75116555350.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077b33eb7cc7---45571027951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+kill+all+animals+in+minecraftPDF 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_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 17508 bytes
SHA-256: 3a6ff9dac826849ad40cd4f2a762641374e5ed1dd9a792a80b2df09f96dbbdb2
font_02_sfnt_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 11020 bytes
SHA-256: 76b8c88452c4260e22a23067897cb8885142b8552eef665c9fda6d8451a1d791