Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cfaf1807a2349f…

MALICIOUS

PDF

163.7 KB Created: 2021-07-08 03:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 693511422fc28465ab10255632f12dc7 SHA-1: a2da2f6aae33178a15c63566f28e7dd4732ef6ca SHA-256: b7cfaf1807a2349fc44598531420e71febfecb18bb7cf8a224ca3fe0b728a91b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence. The primary attack pattern involves luring users to external sites via a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9714

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://anhuifan.com/upload_fck/file/2021-5-18/20210518140733674253.pdf In PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ca24c4a91ed92ec351bc2f91f3c0d1c7/bukemoturarutuku.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/9e4241f23ae651d103f694809ff14205/35751110346.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ev1do2dvfmigbgt7hq3k1uovk6/loxoverepenekonir.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/6d77d45749aacb669c6ea6851e989128/jorebil.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/nevelororejunun.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/36585077601.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/9694408357.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608664a7b533b---72866959372.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/0be68044169db9538c0f26892f0391c9/begijukamanawelesupeba.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/fugosunivogoje.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/efea20f96ea7e888be7517aad96eb9f4/93883154374.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/a9052757977664e178279187b24d957a/sikamaliro.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021062920494173499.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd65ad22aa3---25395721319.pdfIn PDF document text
    • http://apcmagon.com/userfiles/nujazevikixovatekijosud.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/2a9d7cbf60773b6c57b82f1c57c6c908/zaranilixazoti.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/kosopiwivarajosa.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ce07bca1f9b---wutojuledenijojiwulak.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/6q1onhoe6eq67auqk2euhvsm82/89670536242.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8ed174c7d9ebee655fc203432a24cea3/livizasaxeburoj.pdfIn PDF document text
    • http://greenbrier101.com/userimages/sekuvumejaretobabivivaxem.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/luxezi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/defarigirafi.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/52451727226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=an+introduction+to+gcc+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13788 10368 bytes
SHA-256: 96d2a0b9f4c30edc354a680a460b1174457be29363bd66a753ffe6a6996bca8d
font_02_sfnt_off00014ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED9 102688 bytes
SHA-256: bb41df57bff5cea68531a026a1194fb1a60cb573cbce855aa47de352a355f7cd
font_03_sfnt_off00024e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E8A 18904 bytes
SHA-256: 9f3cf4d3a207b2ecd979a778791d71d21494ea1d35b2a368f210682cc69eb515

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