Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9d45bb5a3c7aa2…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 01:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0df36ee280c97a15cfe56a53acf5c459 SHA-1: ec55920967855e3634c0b3d49c2b86f6cecc98fb SHA-256: 3e9d45bb5a3c7aa2017095d281e74365995bae89c87a80ae58a9683e3953c66a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=factor+theory+of+motivation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d76dd98e---pesizaxefe.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/def7d9645aadccabaea200dc20215d09/puxijupo.pdf
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4893388142.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a1e3c9fd---wakirewufikalobomutiwowi.pdf
    • http://alhouti.com/userfiles/file/84247939477.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb66992be---zofusogitag.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a2a19458714bdf085ed55ffc6ffd6575/26591873648.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608639de2cd40---13302329172.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b16a4f2b037---86524523940.pdf
    • http://podhoru.cz/userfiles/file/bavoginuxeralolovufipita.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a62cfd82b2c---sojenuburozitabedozutu.pdf
    • https://studiopros.com/userfiles/file/
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160846dc3f0936---75811817284.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9fa826e05108549d5c38e95de74de9ab/63806519386.pdf
    • https://alihuata.com/userfiles/file/fuduzikanafalidafonoteb.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3141c33241---panipefuxi.pdf
    • http://ciskmv.com/css/file/zaxokulosujesafixolisawup.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/08ddc81a42c6fadf8e36120c791e2189/nuvakitalosuxexel.pdf
    • http://al-bandak.com/userfiles/file/jelovawepujiga.pdf
    • http://cpgny.com/userfiles/files/lokewokuwadolugukinatupo.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f397bf933---64999864265.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/aeba3ef7b4ef9456a0155f94270caba5/zikaxuladenipej.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9g4tm1tukbluef59bhgk29h115/gejalukale.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f123fc566089fc60f6fca9e725044bab/wewakubotupi.pdf
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/94867208455.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_off0000e984.bin
fccf473060e04c8bf0d631b51c21c9744af6a5387015d25107acfdfa8b963d88
pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 10544 bytes
font_01_sfnt_off00010169.bin
dd6cb0a8cefdf1fa76991bdf3fb2c2fea77598239574bbe83bc9c2c1e2c915c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10169 16476 bytes
font_02_sfnt_off00012c0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0F 16792 bytes