Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abb2c0e6f8dc5b9…

MALICIOUS

PDF

99.1 KB Created: 2021-06-24 06:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 091f3e3fbe3ffffe5711cd8e58303f61 SHA-1: 27ba0ad6d889457f5a3d68ff17b8972d55a3ac24 SHA-256: 1abb2c0e6f8dc5b9e20b848d14c0dfef0a018f88536fdddb9a49be4d2ee40664
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21ac633d5f---bisiroxim.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5da3d24795---12878472768.pdf
    • https://press-centr.com/images/file/23077656987.pdf
    • http://okmarin.ru/userfiles/file/79947384547.pdf
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/14798265919.pdf
    • http://billsky.ee/files/file/55274367223.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17ecaa408---suvalopukafugixuk.pdf
    • http://daimarconstrucciones.com/images/admin/file/gedamegelozowejotoseketo.pdf
    • http://short-story.ru/upload/file/wolozejolobubon.pdf
    • https://dodatnagarancija.com/userfiles/file/85576919318.pdf
    • http://morethancars.nl/uploads/edytor/file/86630414872.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac5bd9b554---tuzixatabupuxar.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608939dfa664d---xelugilivi.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160945b21281c2---kofulefe.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098d732471e6---zibapiwozanilatuda.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/go93frq1vbguug86liqec75rt6/wijoji.pdf
    • http://hoshitorionline.com/uploads/files/95321203686.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mercury+and+me+pdf
    • https://medlineplus.gov/mercury.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000149a1.bin
e0269c7a8b46f70b78c9f738925388e67ba1f5cce4b41c73a10dfaed1f068774		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149A1 5200 bytes
font_01_sfnt_off00015b53.bin
717f566328f94ffc83a685a518516adb830442d83cb9f3508e773c3e534fd087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B53 10568 bytes

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