Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfa58bf9b235ceb…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 06:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a382c735d759a26236c420773ed1e4af SHA-1: 5f2215a22f9de900776d8bb665ecca8d37e7b7e6 SHA-256: 4dfa58bf9b235ceb56fa7be9980c66bca6f3b6d6dbf522d7b2787aaa0a29382f
184 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to redirect users to malicious content. The presence of callback lures and urgency language further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://valerart.com/ckfinder/userfiles/files/dawimeg.pdf In PDF document text
    • https://uclerbaklava.com/resources/file/fuwaniwigototepobarig.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/82079355873.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/kokokezagupumimamex.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/gf0s42demn1vodtb6qgp82sco6/31110747502.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06e94b845---7576927583.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/66536112716.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/22b6ae99cd491b37af8e55dda1164985/xumeposonutixitobedax.pdfIn PDF document text
    • http://banquat.com/userfiles/files/banememujotet.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/savifebig.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/dc3e712c325dababeb12eee97d02ccd8/70804129904.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/lepomanejifizaraz.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb63dd66ec---biwadomumopifulanarozid.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079457294752---77301361245.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/zubipodofebimidegamo.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/14842502805.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/vibom.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c892f67c332---jamuxo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ae18a6e4---resipovimudutojolupizofi.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/dulofoxedunitasubifisixa.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/99017733639.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5808a32442---fafom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cook+county+5+day+notice+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/dogugu.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_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 18544 bytes
SHA-256: 91d1d94b5df0e1544a4e78ea9024c6e430dad9396e82c55f2e6a399e9ae41c33
font_01_sfnt_off0001150c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D23 10768 bytes
SHA-256: c4604b6db274b89c702aace043e5fd57b4d90dbd81e912ef1afdf882c94dc409

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