Malicious PDF — malware analysis report

Static analysis result for SHA-256 94278b2709ec3586…

MALICIOUS

PDF

83.8 KB Created: 2021-06-29 18:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83229b98d8ef602cb4d5c2dba9b27f27 SHA-1: 6dad24cc434eca5afd11accc3e3d9d311ddc402f SHA-256: 94278b2709ec35864913320539fe4ce855dfc05d7711e539ff8672ac14416bd1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada062c46f---budigabel.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb4baf4c6---20616898250.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607434e93dda0---zexajalipizinu.pdf
    • http://ferramentabelleggia.it/public/file/nofebubidobafasaxe.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/74b738171e418658829672cd52d59e49/39816802174.pdf
    • http://beastyenergy.com/userfiles/file/76826671849.pdf
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/1o1tsaon360kn7upfqc32s1l92/gurefidevorepagukogafuta.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5g6nb4abtugjtae93p00bhucli/55636821362.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa707674c9---nedejoxew.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607df44004093---zakijojovenisatuduj.pdf
    • http://bjsprt.com/uploadfile/file///2021051311544438.pdf
    • http://www.firengo.com/userfiles/files/pexesizuxafutimopufofob.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f3ffb2bae2ed07b6bd423d29131acf3b/79039469282.pdf
    • http://ourdesign.hk/ckfinder/userfiles/files/21156361981.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210621164242.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607726396bad8---67260860277.pdf
    • http://bilmatbasim.com/userfiles/file/selokezitufitutuwimifeva.pdf
    • https://dascalita.ro/app/webroot/files/userfiles/files/korol.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2c323075a9cdb9dfd547c3ff5a5d93ad/filovovu.pdf
    • http://tuning-zone.eu/userfiles/file/57625307139.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/6hknnsf2fmm9l4qvombr0o4j26/29729776669.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/0d25d6a19034aff9b9cc2ad363b665c0/makirikekorawiregofujogew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=area+of+cylindrical
    • 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_off0000e4dd.bin
3d3001bb1f35c917de512f2cf926109179754db2b852aa4ec70c0218e772108d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 17564 bytes
font_01_sfnt_off000112e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 16792 bytes
font_02_sfnt_off00012afc.bin
e96a4db41fe2835d3e2581c761cba0021bd12e499939f64833d318c79f66ffbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFC 10300 bytes