Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63ddbf1f07cd009…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 02:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea0d35198ba766c59944386fa05e77ce SHA-1: e9c1097895333855721846304b4b44350683e925 SHA-256: a63ddbf1f07cd009d022ae741ee6bdc3cce7efa98f1c5cabc615d761d57181f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mav-auto.ru/images/file/12196210007.pdf In PDF document text
    • http://morgancountyoh.com/userimages/10101614778.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/burusefukizi.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/68968805354.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/338e41e421acdc5ac1b965b57a6cebdc/wegajokitabarav.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/rgv7mocdsdt7selqpj3l1t7pgc/tonepavenoteteje.pdfIn PDF document text
    • http://valeneighbors.com/userimages/86944991532.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/rabadixuz.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fejonosokomosone.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dr8oq1vlq61f4ao57eaeq0pe90/52053439479.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/59600883560.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/wagojedujijejelapozo.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/wovorizemofuvimowumez.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/41018921424.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc743aeaa---larejinipipomar.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/jifovizavox.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/juwofemirawoguxol.pdfIn PDF document text
    • https://luminex.pl/upload/file/sexatusefik.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7ba60401---22735764880.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e101b747c6---15753423720.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/gapowunobetu.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/fajikafavubola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=function+of+h1+histone+proteinPDF 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_off0000c6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AF 17104 bytes
SHA-256: 75675452ff06b310c5798f3be6677b90f3973c57dac8b85e1bed48c4c33602ee
font_01_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 10500 bytes
SHA-256: 159c02a448b1b77b29ec3931b0c35507e8e411f3d9f0df906e9905a54fbe3e0e
font_02_sfnt_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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