Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a498c32452b7a87…

MALICIOUS

PDF

90.1 KB Created: 2021-09-05 09:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d472c83b9850696f8c5f2f80999b615 SHA-1: 89aa43cf8ca457ddf11913d87b770667bf20f493 SHA-256: 1a498c32452b7a87a821599917c06c6de046b5e312d0c89b11b717b341e301cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=automobile+engineering+diploma+pdf PDF link annotation
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/236383879f40f5c3e2431449cc13e003/39649048660.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///rokebibuzewopuxozorebebul.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/selakebazevozisonebev.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/vabape.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0fdf3d8fb---82865646277.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/jawatul.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/54647886125.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74ff50d869---fugunupenibenipujuzolaw.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/semutebimipibivojofe.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/dccb991640f87be5d087ec13ecb19bcd/36205819954.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee32f079ffc---21771663776.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082dbdbb617b---88999565202.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4d7828510---besupeginedebawetatifenu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d5196d52e5d---8484929502.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/japejabe.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/toxem.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/75906324060.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/99394687910.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5f6f799678cc3d0abebe4e839eaebe4e/puxaxaramemeremesixixorid.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/64655483554.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/8651b687a292100e743afea07bcd6b3e/53142795164.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/12879293254.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/k335ojndncmiqqp0641m96h50n/xabuwoboluxuro.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210801122422_63535649.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/9873338332.pdfIn PDF document text
    • 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_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 10896 bytes
SHA-256: f194fd485986c94c86b97766da092afc5b8c398f6f0c44ed7e0c2c87a0cdfede
font_01_sfnt_off000113d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE7 18052 bytes
SHA-256: 86345da4bed2888fad1b0b1f06fedba0b73e25bdcd33fb8b5de5a8510785e2f9

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