Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ac957393bd9230…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 10:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ee941a676d920d446c50b6a7f4862fe SHA-1: 6eaf924884488369a9bd31060ca09d5a5a4e40e6 SHA-256: f6ac957393bd92308b477a4fa84ec592349245f0f668ed30e6ebd370cd1a5ecf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=aplikasi+edit+mp3+terbaik PDF link annotation
    • https://imad0c0.com/js/ckfinder/userfiles/files/1976589210.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/80066312479.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/36271993091.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/riwopo.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/6125912340.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/41426236420.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/11709184824.pdfIn PDF document text
    • https://datajournonepal.org/files/nutezumerimuwujozoxon.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/dufek.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4094bb3585632f26804ba899a0e23196/50682530489.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/39089252317.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbcf313671---88565423753.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/27642591181.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/03c78409e3d92a25f20d11418c82607c/tusavugaj.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/60089923839.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/vivukamebafus.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/jabelojulebugibevi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613972291bc66---fuluz.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/xipebax.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/90610807476.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/lasavupabu.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/sudita.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f0a19f319---50658507555.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/19205058138.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_off0000bdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 10716 bytes
SHA-256: 88ec5c645820ba373628a2d49dc4a52735a1bb4f12d6858ba3aff697d5c3c443
font_02_sfnt_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 16604 bytes
SHA-256: 66269b8f0a0b50ca45364504792a3c76f8ee6b88821fc82abec4d5a45ae0973b

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