Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3feeb1de23b5c1…

MALICIOUS

PDF

72.9 KB Created: 2021-07-23 03:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 666f0f2c7ab9983e887bc739acca7259 SHA-1: f393db7e6cb304bb599bb625f0541a1ed174e52d SHA-256: 4e3feeb1de23b5c1ab3c50795f8fc78a2826eb999c18afeab4b11280b5821c2e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous links to potentially compromised CMS upload directories and disposable hosting, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to deceive users into contacting a fraudulent entity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • 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://thechelseaff.com/user_uploads/files/15229541689.pdf In PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/besepariwusunugi.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/zeladolozulutepobob.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44b8cdad39---56592512705.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/df025244f2424676767224dbdf7a9316/21347942144.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/nunukesufasiladezumav.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097abae4c5c2---89247729728.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/zidaxajenikup.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6dhoj5vh7ej5velem8evsdquk7/diwapilifi.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162354274023917656083.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/39679137542.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/kesuvidizuduzi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/nabupupameleleka.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/923287915af28bdb30efe6cb8abbb313/mipasowapefep.pdfIn PDF document text
    • https://akemi.ro/hirek/file/kuroribotetibejojifi.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/80395031325.pdfIn PDF document text
    • http://beateromer.com/bilder/file/65190097655.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ed4fb0f21---xisuson.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d1b1084c---89000200970.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6a8e74a87cca24fcaca2e9066e5091fb/numare.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/kixapewawi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/33c0091d2d0cbf1500a4b78a8bcd2aa8/67975740979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=why+is+enoch+not+in+the+biblePDF 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_off0000bbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE4 16460 bytes
SHA-256: 27defc3eed39ce8d510f305e0cd4b64a3a692537ef52bdbb5edcd6d60250f7fa
font_01_sfnt_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 10312 bytes
SHA-256: 32d5948734ecad6a720a39eb4a887cbd1dea8f9d1ca7a3cc9d64af0355f7b200
font_02_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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