Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12676345f362f44…

MALICIOUS

PDF

93.6 KB Created: 2021-07-05 12:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09a228c0bd87666cb14bfdbaf52ad9a3 SHA-1: acc576b2d71e36626683e0ee6dcf8343e8272083 SHA-256: a12676345f362f441e3b14b0e763bd4edbe02151c43ca23e42b44acad0140bdb
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised CMS upload directories, suggesting an attempt to lure users to malicious or untrustworthy content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristic and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.centralperdana.com/file/14584117988.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfae0aeea---momexonifabanove.pdf
    • https://ksuskalology.com/images/file/98897490705.pdf
    • http://email-database.info/userfiles/file/vebarivopifep.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hu5qpjaoaolfj7ltft0rnb12v3/44840039983.pdf
    • https://atcotourismtravel.com/userfiles/file/40984272900.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/18cec6c84779bca462307347031cd1e6/riwuvesifokonulifodut.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6d46115c7---kapavekejivekal.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/m1tqb9llhuc7kkknbj9hj491ce/jafegubi.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/13a77880cffb9709e0b66151014c23ea/fajafozagunigetota.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0766b814d7---xajowupezupizomekexage.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943fc25abe4---ziliwar.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/b20970e4d9ca17028d1638f57f2e1a8a/fepezazimamapokexureviw.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d8a958bd---kapoxaxebuguduxedako.pdf
    • https://mama-light.net/business_school/uploads/file/savonev.pdf
    • http://cuatro-pr.org/sites/default/files/file/73047507357.pdf
    • http://abwingsva.com/uploads/files/27450814757.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/97611379900.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607401a18e36f---94311882953.pdf
    • http://macabrey-luthier.fr/data/Files/relojakutijino.pdf
    • http://aucoindeshalles.fr/menu/file/getimirawolo.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b92b900d0c5---nudadabulejirojewalivuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=crow+cawing+superstition
    • 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_off00010b8f.bin
c2687a26a271a9bc30f7e5bbf209fbbd0bc8732ef115905b6138a063aed70d10
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 10720 bytes
font_01_sfnt_off00012469.bin
f2057d2d50d1ad4a8eec520d27bb6637cac6104104dbda95554d9af48af60a95
pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 17232 bytes
font_02_sfnt_off0001514e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1514E 16792 bytes