Malicious PDF — malware analysis report

Static analysis result for SHA-256 2adf517b76f1fcfd…

MALICIOUS

PDF

86.0 KB Created: 2021-08-05 17:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0642b8f055d16e16943e90738d51b8f SHA-1: 6b95342a6c667fbc468b20ee1906a4b340f348e2 SHA-256: 2adf517b76f1fcfdc8c72448ec996250f1e0b206387d564d1a35868b88c010a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm strategy. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classification strongly suggests malicious intent. The presence of multiple external URIs and a link farm on disposable hosting reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=marvel+avengers+academy+game+apk
    • https://idd.no/ckfinder/userfiles/files/3826306949.pdf
    • http://kopdesign.nl/userfiles/file/92895337832.pdf
    • https://aletihad-group.com/userfiles/files/bukononobitegumetojilo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f33b2a0f885---97036318396.pdf
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/jewiguvute.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a610a8b2a12---legagaroxegevosixesakak.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/zofopitakidu.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9dae46b9---silofuwi.pdf
    • https://purmoradiatoriai.lt/images/files/rotikefejamafijelixike.pdf
    • http://teplospectr.ru/images/files/4799488097.pdf
    • https://thediamangroup.com/_images/files/29432166668.pdf
    • http://duhochmis.com/files/uploaded/files/30148381324.pdf
    • http://risorsaterra.it/userfiles/files/zodifuk.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/v8k57lat4fma30q6ut1js1mtvr/xipariwifumupevaseviduw.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e728062f7---18537842369.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160903ee25aa96---fudulagof.pdf
    • http://ranagro.com/files/koxulugiv.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a3f23e12cf74f5666808fa170c954431/97356953383.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/fed1d7b1c9707461a0d2937c2025e0cc/deludije.pdf
    • http://apexibd.com/uploads/fck_uploads/file/widaxejadu.pdf
    • https://dialogueinpraxis.net/files/docs/parewaduxev.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25222049c---85747427482.pdf
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/xixaz.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9daf7c3b9e18486ae1a6454cb6072568/zafojogotonajom.pdf
    • http://synowka.pl/galeria/file/55937324425.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ed98384e---tubiwuseg.pdf
    • 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_off0000ec14.bin
fbf424ae2bbb29f25f93c33fea036496f0d216c77d83e84c76f3fa07fab13aaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 17280 bytes
font_01_sfnt_off00011943.bin
f6deb348a239be44bcfb0dfcbf668e47a153d4122dbabd7757876715f2ceb28e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 10812 bytes
font_02_sfnt_off00013202.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13202 16792 bytes