Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fa218859f1a272…

MALICIOUS

PDF

75.1 KB Created: 2021-09-12 23:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5da3d720e19e54a4a72972ab07b59816 SHA-1: da326b56e75e51be1e83b3478062e626061e5381 SHA-256: 73fa218859f1a272fb82293a176ab8a30d5c63ca2da2e087c7f173deb01ce1e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to disposable or potentially compromised domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://arc-en-cielproduce.com/ckfinder/userfiles/files/33458193740.pdf In PDF document text
    • https://marblobathware.ph/app/webroot/img/files/94413832670.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/wasabokiw.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/38866505766.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/sizesorenexejumakopavonu.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/4008723081.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/88860206530.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/sokofalasoxulo.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/wiliwamilunazexuwub.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/nejozavezibofaki.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/99917383890.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d19e66b91cfd94cd8e4b77eafeda0e62/73581346030.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/diwofazavu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4efbe7471---14313310415.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/fibaguripig.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/rufubekir.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/xerofuxagufe.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/316662130.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/33674885173.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f25ba036f---91349788574.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rurakowufeganaxuxubaxepun.pdfIn PDF document text
    • https://premiersuli.hu/files/files/2547558980.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/15475042443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tom+talking+2+modPDF 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_off0000c324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 17320 bytes
SHA-256: 1bed140c1b18be62a25d895017ec813a7d2273e2dea23ee39ef2e8a17adfc229
font_02_sfnt_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 10368 bytes
SHA-256: 6780e7b9bf49e7d9e726ee306f2a0e3cc1a074a2bc538ec7ec961fb848519274