Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13fec0af8b1a6f8…

MALICIOUS

PDF

68.1 KB Created: 2021-09-25 15:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f98e9b69d5f299733d55bd7e3ed24a1e SHA-1: 37be1a5909836383305aa8bd56252208a5728190 SHA-256: c13fec0af8b1a6f8bc1927de553cf179e1959f077f81153ceab222507c8ba566
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a clickable action and containing numerous links to external websites. The presence of ClamAV detection and ML classification further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://allytemp.ru/uplcv?utm_term=fifty+shades+of+grey+book+pdf+download PDF link annotation
    • https://commonlawhouse.in/userfiles/file/sugulavefa.pdfIn PDF document text
    • http://abpaluso.com/upload/file/ruvesu.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/zogubufob.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/50551872941.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/47227315904.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/74676398214.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/lamizamu.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/turirigagozesudegosub.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/79196740442.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f781a005d---78406509777.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614750a391617---kuwatipesulu.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/25923291758.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/90242766166.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/40919779121.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/58244457784.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/wedatiwu.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/nopuzewajadokigo.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/39645524017.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613340cd14ac8---japejivav.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/pakevat.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/sewemugepulilutexitekesuk.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/xigototitipolagexa.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/vupibanoxadekoregeb.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_off0000ad73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD73 14196 bytes
SHA-256: 5b76c536bd0ac75396ff1afdc180459ac70df3939e8c846829e9d04f61331cf5
font_01_sfnt_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 11184 bytes
SHA-256: c504295922c4524ad69c6b30a37b7e3e0af453ca19460388bd4b78132b4e714c
font_02_sfnt_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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