Malicious PDF — malware analysis report

Static analysis result for SHA-256 457671ba01d4b92b…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 14:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f56cf9e578e395ee785952e0b5d5700f SHA-1: 69a65a970f00a0c32162168423e01b0dcd343e42 SHA-256: 457671ba01d4b92b5239c8539f8fd727debc8ee6878a30fb1989ec3b533b8651
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into making a phone call, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the presence of embedded URLs and the phishing lure strongly suggest a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9n2evr6n619j6aajs4pub99b10/54284453493.pdf In PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160745b28c2778---nutabisorunuradorobolu.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/gufezopenevixaje.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d30b29116c5bd5bf7ed865b912cb0141/22331056383.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/4912438364.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d541c7202078caf102361ab80b5a9e05/zekakuvotevuwegevif.pdfIn PDF document text
    • https://btegypt.com/file/44430836923.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805d91a89bc---83044558870.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/joneretokuzun.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/71505855477.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb1cb61ba---subowenasazobilolutun.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4315b1468---81134908896.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/24115185234.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/64d56fdfbce1cd44820e1cc0e7bcffa5/99940531461.pdfIn PDF document text
    • https://luminex.pl/upload/file/73628017217.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/d1a7de92200e0e2b7cefa902ab885e11/31807536135.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/mipagu.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/54831092370.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a404b8bce62---rajatubade.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/394ee9041825fff20e0c0ffabeeaf098/sezunekimefavegepupin.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/so82cn94e2rtugqnqph2i0vupo/66049428398.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/jajafuvovidak.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f65b4370959cb85b4a850bbed9391dc8/78315984750.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/d8b0d5df45055dc5bce1f2fe1bfba883/23238111357.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l4khssdrvbbsgcovs3pds5coh7/15474293326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=papers+please+apkPDF 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_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 25916 bytes
SHA-256: 7aa3ce2f21e11beadf5d383169b76517c41bf2537f51d38de4380b3ed9bb0be8
font_01_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E5 9924 bytes
SHA-256: 9ee051d8cfb6fdbe870aa605e55035a881e42fee4bed39e8ed160d7808da488e

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