Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3701452775138d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 04:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dec1f291df7fc71daec85d10442cfb89 SHA-1: e6a67757ca2a9f2310bfb6f886d15c08f1c65961 SHA-256: 1f3701452775138d5793b1ff184e2f48ee61c36c931d48bd1e3c3e4cfc134e53
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and a 'callback lure' further indicates a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=duke+nukem+3d+n64+rom PDF link annotation
    • http://profil-metall.de/content/uploads/file/69422914367.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/sazaxafiku.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/wasitezubumeziw.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/17383116776.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/80721252053.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613240536d869---linalolus.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/sutegafuroniwodu.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/jewogobolorutoziboka.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/povinogugubusolixi.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/70900217912.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/70489798502.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/6639746003.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/18691647077.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/16238354589.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/91500226520.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142ddbf9c1d3---31630231693.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/botiwemi.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/fuwerefiduzurerez.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02aa894a8---xaduzojozobuvojamepeta.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/90085643507.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/87044041462.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/zuvoripotinesedapebu.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/5327618592.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/vawot.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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 10456 bytes
SHA-256: 2e9f92c82f330ca677a1557365428794d32c6228a0c9022c6c5138713bbf2e87
font_01_sfnt_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 18940 bytes
SHA-256: 9a44dcbcf26a47f2aad523000bd3c5c3988765adbff2bad523b4a079cd7c2b79
font_02_sfnt_off00012abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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