Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1fa1e56d41b730…

MALICIOUS

PDF

80.5 KB Created: 2021-08-01 11:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f55a42f13adea8bf1f983c53d1bad20a SHA-1: 0e7befdd5085e9b4ba51b291e8ba51993e565828 SHA-256: 3d1fa1e56d41b73034643fc11fa60035243b80a76486958502945d58ba9b3242
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://inwebjor.ru/uplcv?utm_term=libro+minna+no+nihongo+espa%C3%B1ol+pdf PDF link annotation
    • http://ingmontagna.com/userfiles/files/1869843095.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/69538505540.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/90953f8eb7500c6456e13b35f4f1d922/21890058739.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a791ff378fd---forawedejib.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/vufemalutakos.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/texovixe.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/kenevadawosa.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/pemuniduxowo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827107d5839---92139019773.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a953d0701e4---42531346739.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/12056650517.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/91421790390.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/dorusesuparuxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c41d42139---gubobulerozulunutiw.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///46725115543.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/bozura.pdfIn PDF document text
    • http://bluiettgriffinwilliams.org/clients/2/2a/2accc941c041fffeac9751862bb8fe41/File/gupob.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/14519412410.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/pitesijaxusavafixasulux.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/somobubagisuzedu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dh196iekv5s7289vabb5tiued0/11906004560.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/dafetidoxapawetagofigux.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/xoxiserez.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/63845745862.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_off0000d28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 18196 bytes
SHA-256: d2ac53dc60c232d0ecdd2d7458d718d7f01b1e0e58c21276db22989a3fc91db1
font_01_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 11148 bytes
SHA-256: d7c5e3ea3e79bebe115d83bb0015132d66a26346f0561e009d1899a542d60339
font_02_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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