Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72d40630dd5c7e2…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 23:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16d049e89b79df3360d155b31754bba5 SHA-1: 7e1579a89fe6b24d6accd7c36107a99a9e66e4a2 SHA-256: c72d40630dd5c7e2d64cba6c1fd7d0dbf2e15ff079e2d9865870196bb6cb29db
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive use of external URLs and the nature of the hosting point to a common tactic for delivering second-stage payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 https://smidgel.ru/uplcv?utm_term=best+sensitivity+for+pubg+mobile+android+gyroscope PDF link annotation
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376143422df---nubesulupetipagulus.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/goromazelaretogokijo.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/34319747012.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133140366c11---jotemabupukuda.pdfIn PDF document text
    • http://snsi.jp/image/news_file/59098029652.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/kuwalerozijowik.pdfIn PDF document text
    • http://cartopack.be/Images/file/40550578457.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/64180921051.pdfIn PDF document text
    • http://flomojapan.com/upload/files/26577532618.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/maxujunamojulaxobesitakuw.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/kabez.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a7da0087---45805772177.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/wivodiga.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/fivid.pdfIn PDF document text
    • https://subded.org/userfiles/file/1087384577.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/pifulekej.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/zikuburugufanaxurapolo.pdfIn PDF document text
    • http://espokebar.com/uploads/files/95246019942.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb3f06db29---69868068310.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d75f31e7a0b8a5168256f2d4319acd3a/terew.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/lanurexe.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/84818641855.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/54335500786.pdfIn PDF document text
    • http://lukinserv.hu/file/81564062466.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_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 18336 bytes
SHA-256: 11fa2266c212522539a2e587b5646788cf1876f8c26cef58fb85d65b8aa95f85
font_02_sfnt_off00012b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 11436 bytes
SHA-256: da5f8da67aee29af2449280c5313f93f1efca68d6ac23a7d90519bc4941f3539

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