Malicious PDF — malware analysis report

Static analysis result for SHA-256 957b6fe005585645…

MALICIOUS

PDF

78.6 KB Created: 2021-07-10 08:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2a0af2d7416907a28ef8c990c3bff1b SHA-1: 8ae3e864ac9cd52eaad83f50504c6b31c368a6b1 SHA-256: 957b6fe0055856459b489e0217d8609da349d20b6170050968c0364e9af41f94
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics strongly indicate a malicious intent to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://acgroupenterprise.com/userfiles/file/lelerefafelosaz.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0fb9aa799b19f751beafbe06002b5b6b/79919463866.pdf
    • http://nutronicltd.com/userfiles/file/12957679761.pdf
    • http://akinmedikal.com/uploads/file/1907434400.pdf
    • http://nickels.design/ckfinder/userfiles/files/14290794360.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2qtkid2dsv3jf9cv5mfv9edvvi/ruvog.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/d9a15ku94a4iqrb3ulficvobe2/vador.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88eacacb56---27088740053.pdf
    • http://www.deep2001.com/images/library/File/60610507770.pdf
    • https://eyetracking.pl/userfiles/file/bomoriwalidodivevod.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160983e85eb4b7---vadekexuwokujoxut.pdf
    • http://train-in-japan.com/images/blog//file/vazowotobodoral.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5af857ec4---rupagobupaxil.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984af102cbb---53187899706.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e1860263---viwudilig.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb6e8da6b---22866890862.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/6c411e9a4d4f3f518219017db6480b8a/41411077467.pdf
    • http://antifftech.com/uploadfile/file///2021051007022175.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f62216b6fa08d4225124f1f47e3e2414/mozofigareponofefatapak.pdf
    • http://macabrey-luthier.fr/data/Files/63035954187.pdf
    • http://studioingtassinari.eu/userfiles/files/dudezikekamusizejono.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/443hm4j8igk5m7jebbrnvme77o/pofubewemawanijulelalu.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6b9c6119---jexozijowupivugimixiz.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed610b0745---78720593941.pdf
    • http://shinies.ru/img/lib/file/ranaduxubaradojomozuga.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=level+156+word+connect
    • 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_off0000d037.bin
72c38f61ad73e2d9ebc78c0600e96498b6d4b5be273f64207e866e5553c5a36c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD037 17672 bytes
font_01_sfnt_off0000fd47.bin
9792922c36447ac48d7d8f8bbcdfcffbd8e88692cbeb424d373fe982d9006060
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 10404 bytes
font_02_sfnt_off0001151b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 16792 bytes