Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ef3fa7669142d8…

MALICIOUS

PDF

93.7 KB Created: 2021-06-30 23:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7911f665f7e5033654f66fee1a41ad55 SHA-1: 1adf061e4413618065a3a369887bf15d0f38adf0 SHA-256: d4ef3fa7669142d808ec116a936bc46577c615cfe0a09b460f72c538f9029e6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to direct users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm nature of the document is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/tanadote.pdf
    • http://akcjonariusz.com/UserFiles/file/vogabekopiposiroroxaxa.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4d47d37c---tixubalisejojuz.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607496ea2c38a---65999972432.pdf
    • http://anvlaw.com/userfiles/file/rovawodo.pdf
    • http://sarlampa.ru/upload_picture/47750140514.pdf
    • http://shahnawazonline.com/uploads/files/11390726741.pdf
    • http://deltastal.ru/userfiles/file/90634039810.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160833af49354a---69359721504.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ndd2fn9p1k0urrdptb8m2qvqt2/58665784500.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/86d78229bc42b8dfd67a68d82f81f6b9/gedozenidota.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0c6e196f---gujokagojitidax.pdf
    • https://aterhesseg.com/up_image/file/30016045843.pdf
    • http://jjmcp.jp/userfiles/Image/file/gafokofotezu.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pqm894h7mok3cc519ji6hrs74n/39498628346.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/upkh4ab16efea1ao7rvfomuvv2/gexoja.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jr187rlc364r0f44rnforuljn7/98384304891.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d9660ea442bb72be3266bc8c6aaba59f/40050290653.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6f7578b60613b16bd0a14577f3808e66/30557870735.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3b0ebd0e---66787984159.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/e6c6805fd0b1d5fbd285d6b17c5f5cde/pipabatom.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c857dab644b---nafitegepamevofo.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a6c4182023b4393e5424480ba3312112/21701205789.pdf
    • https://sambelteri.com/contents//files/17530540685.pdf
    • http://wellfoto.cz/pictures/files/bivodidovakavugiveder.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=free+voice+changer+male+to+female
    • 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_off00010ad3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 16792 bytes
font_01_sfnt_off000122e5.bin
328adb36a89f4a27d55a915971e9a2dd446762de9ee43e39366bec75b1bd0ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 17656 bytes
font_02_sfnt_off00015146.bin
df596f1f263f6acb1bec51d2be3024efc18f366dcaad2b922016e99ed2dc8f7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15146 10656 bytes