Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f327d516bc12d1e…

MALICIOUS

PDF

97.8 KB Created: 2021-09-01 19:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49c7bf6117a0fca10af413490deb8f25 SHA-1: 1f4426ad7367c1130a02a58f7c615cb704591aab SHA-256: 5f327d516bc12d1e47e6259dfe3c0b5ec24f3270324076745de27ba5d150daf3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd16dd50c22---gitenageg.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/guwavifubekedipep.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/zitepesijupose.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/rimavenuveg.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/84064741003.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/30557077071.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/xijanabegitumofebaj.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/14315724157.pdfIn PDF document text
    • http://asfalon.com/__files/file/56832719744.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9f1bcdf6---pirixovokizaziwomex.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/fevenudupopulojafo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec428257b25---dasizonasek.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/fuberaparesik.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/zigobiwaxumof.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e183ac58b---luwirijutipazuvuledurula.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/97628040859.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/zodumumagekerazuzi.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075425b85d81---2719933996.pdfIn PDF document text
    • http://falerisztika.hu/tmp/43404540484.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af2cb8049c8---ralusajila.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ca7442f558280bf62fbe909bf1f7c876/99817151312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tn+board+of+nursing+rules+and+regulationsPDF 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_off00011627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E39 18872 bytes
SHA-256: 3dfa819693d5fdb96d4df34cb9a0db88c26c7ffb21afb63b185618786e7c175b
font_02_sfnt_off00015fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB8 10732 bytes
SHA-256: 139f113e9cda0fad7b97cd50eeb9d495aa69d9889a9e23d7770775c9a68353c2