Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2941c34dfce7479…

MALICIOUS

PDF

89.0 KB Created: 2021-09-21 02:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b25d769b4a7a60c6c095e89079392c0 SHA-1: c72c77982539d5485498e117ad0993a1c2e2b78a SHA-256: b2941c34dfce7479cf0aa68fe02adc653e11e84d7d05210e255727d35ad19a24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://sporteambiente.it/ckfinder/userfiles/files/nirogi.pdf In PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/gozazekisemeregatefijob.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/47535520266.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/20200514440.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/lozevatalapiw.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/dawuda.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/9up4h8m804dc95mplperd73p3m/29992277583.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/49291291394.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tazivodaw.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puperabodipeja.pdfIn PDF document text
    • http://falconltd.pl/cache/file/44016297671.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/16745497317.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/54573421747.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/gefuxumevuken.pdfIn PDF document text
    • http://123dvere.sk/files/file/muputufetipalikubaforu.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/32863495043.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613052510a09f---96843302236.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/nifan.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109102249462977.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/62140783360.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/996e76942c4684a8e28e3ec41432e805/9145936188.pdfIn PDF document text
    • http://elpijisystem.com/file/nojetemoduferuxor.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906102450357.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ff8a846fc---xabufidasurolik.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/14b679b8f12a264824194e4ae87b5886/1291076067.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/74644002202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=list+of+most+populated+countries+in+the+worldPDF 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_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 11028 bytes
SHA-256: 1d721736f4ee674f002a29a56de5ac92f0f132fdb7052d9f29609d9b89decf45
font_01_sfnt_off000110f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12904 17440 bytes
SHA-256: f9352f1c2cc95e0052738ce0b2bddb19caff9f830469bfd7e6593712850fd8e3

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