Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f51c88f713eb0ab…

MALICIOUS

PDF

89.2 KB Created: 2021-06-26 15:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 81c3b1e8433d588533f7f9cf3f8b0014 SHA-1: 28e1183ace5809e84da0549270f8c6c42f33c774 SHA-256: 2f51c88f713eb0abdc50278c2ec48d966f0755d3eefb42b1953e7f81fad95017
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing attempt or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a25fd0377f9---92186908261.pdf In PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/33d120ec7ace71d1b732724f598f7026/kodosimudigavazimodizew.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/cd0fcdf5c9b1c9a47bab8047516ac3b7/26373700754.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/ruwajafenovotanerovavinod.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a6ef040ad---80032749028.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/leroj.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98b2a87463---keguvaxa.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae504dd664a---fivukilomavozo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9bo5pnbh12fjd9ehqqqv010jnv/fimafim.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4dda9e917---48539791797.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/13313886074.pdfIn PDF document text
    • https://afayl.com/userfiles/file/21758598994.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/1310997248.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/f40afe39008f8e7d0791831ce39ae79d/82596454610.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/wepatobopekidubulizosu.pdfIn PDF document text
    • https://schmitz.cz/res/file/kubutotozipo.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/237c26cc4a441d58171c153368921170/defop.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/aa8c87a1d10224269a28e9425deb9444/vuwamuwo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097154c081f4---fisum.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512025107270218.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/q30upngbr76i9svtef5f17b35o/77764575572.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160886b28767c9---pewagarosudibi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e43c5aee3---nesazobamif.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/sl4tht719hhfbdme7dgnggqjq5/4264956338.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/p0a52dijcpkd0h73iv0ag8pbsp/6742244365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ielts+writing+made+easy+bghud+pdf+free+downloadPDF 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_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 22900 bytes
SHA-256: 2829053eb83fef507000349743d73a8a5e5230d67de06c984cbba3f0b25e7275
font_02_sfnt_off00013af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF5 11336 bytes
SHA-256: a3a365a8ea48a583e0c6883e58b859bafdafecdc2e0872c0988c118a21ddd3ab