Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe427a97a9238303…

MALICIOUS

PDF

83.6 KB Created: 2021-06-25 19:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8729d277d7ca34b6466227b3c84a723b SHA-1: f4ff5673da44618a501643ca7ac8d569819cd48a SHA-256: fe427a97a9238303d5b7184dfc1c6ec4ff3782537c5464417b4268e8e344d05d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and contains no readable text, but the presence of embedded URLs and the link farm heuristics strongly indicate a phishing or malware distribution attempt.

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://crewmak.ru/uplcv?utm_term=captain+underpants+full+movie+in+english
    • http://toyotalongbien.org/data/dulieu/files/86594018096.pdf
    • https://juhaszautovill.hu/userfiles/file/69032107816.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160803e683351b---wizifeteweferidinub.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/a5j8jh4nms2qftu6t7ih1gev57/solomafesumikorilevidu.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10cf0e034---kelerifotizev.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/62a1b151cb9a0347dfaed86df635c7a7/gakipegorevofubitukigiwuf.pdf
    • http://www.chatanakonci.cz/userfiles/file/gowobibesizedixuvopeke.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d942450c10---zusapumivibubo.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3829cc434242ff5499bcfd68ed099361/50667804551.pdf
    • https://roomart.uz/ckfinder/userfiles/files/dowobaveledewujerujav.pdf
    • http://zovsh.com/Uploadfiles/files/58211426961.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/3c1fc68975a1aeb1ab92927a339a5efc/62658638055.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d61ebe9c0208682e25ccd085d25a2df1/xurorotabelokaji.pdf
    • http://tulga.ru/editor/files/tibilisuzukadirok.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/juvujul.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/88204ba44ed0840e3db0edd898089e48/50584867831.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0dc506d0d1ff0faf68413978f49363b9/36882283077.pdf
    • https://asiarsolutions.com/userfiles/file/88797958834.pdf
    • https://mariellatriolo.it/public/file/56445783677.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609faf61a9d9a---vovedetinowuvorefubixidub.pdf
    • http://www.centralperdana.com/file/21955412532.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8a37308f596c6f5141e274ad92df147e/bizofaxopojovevo.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_off0000e155.bin
5d6432b18f4b10d3b67df6e59ff5074e18f4eeb4a506d4667cebbc36b2304cb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 17380 bytes
font_01_sfnt_off00010f15.bin
f1a92a6b055570218c2569dd535b6f2d64b3084f13775eeb3db0d4c6901ee53d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 11144 bytes
font_02_sfnt_off000128c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128C6 16792 bytes