Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a16aca54cff8852…

MALICIOUS

PDF

92.3 KB Created: 2021-07-15 19:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ab24e3b1fc508a6ee5a8b9ed9f43ddf SHA-1: bc8319d41077354f92be9e15db100d8d6a60a1b0 SHA-256: 1a16aca54cff88520d5222546fd18ca42c470641d6c4f3983a3c1d57fc7fc3ef
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL targets are indicative of a phishing campaign.

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 https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607500f701e48---nigawimujonekufuk.pdf In PDF document text
    • http://technestudio.eu/userfiles/files/47450779174.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6f149ce09d92766a3c63f7a5b6a8350/sumuperiz.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16087464869988---8370781227.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e70576c599---fobixopalived.pdfIn PDF document text
    • https://binhvi.com/upload/files/33322931318.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c5f45ac76f87cb79de7e336b57561c4d/26790077630.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/xuwipigigawaboteniwir.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6c59f0074---magejadumusejo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5a8b13202059f8fdc04f1c822bb03c7e/jegaxomabul.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/o822kihftselouhb7d1sje2365/nofefolet.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/52963309967.pdfIn PDF document text
    • http://tw-go.org/files/soxakepozinuwuviz.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/64790775548.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9e82e2eb0e80ab685db8207190ba7e80/newawurufotopokerogite.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/13350012424.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5e00599aed36b27d1f97c8dcd9512f85/18655206771.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/pigopenuxelovadaro.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0e02e1f0d---zewazok.pdfIn PDF document text
    • https://webmenuplus.com/images/file/rezepiripaxovi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/i7afn7atqhmjjo8p9idiurvft7/vizevumelatetekogomu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91819171d---53972833668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=authentic+leadership+questionnaire+walumbwaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 11232 bytes
SHA-256: c7f0755985c2b2652fe341fba0831d1e5f41bc5e3f88e8aaebd04ecc62c09dea
font_02_sfnt_off00013671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13671 17440 bytes
SHA-256: 564cadcda08eb03253160204f8a959a0a826efa7194f66d40bbf9b50ea45c4cc

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