Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0659f67cd65cf58…

MALICIOUS

PDF

83.8 KB Created: 2021-06-29 10:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1f3acdb7650a8ff58cff8fd1caf29b9d SHA-1: a35bc682e27744f9201861ad76c20d7c61ac5316 SHA-256: e0659f67cd65cf588692efa006079e59fe1501f02c754403a3c816bb0114bc22
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a fraudulent phone number, a common tactic in tech-support scams and callback phishing. Although no scripts were explicitly extracted, the presence of numerous embedded URLs pointing to potentially compromised or disposable hosting services, combined with the callback lure, strongly suggests a phishing or scam operation. The file's structure and embedded links are consistent with a link farm designed to host malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 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) or Microsoft license-boilerplate 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 https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d1f14eba256f6bd3e7d05102adf3463/vekulamifuwadeg.pdf In PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d5a81548b---mefulususo.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/subugenana.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/41279268850.pdfIn PDF document text
    • https://bio86.net/fichiers/nonak.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6c853b789b40533167ed50c7caba2c9a/lavanewetalasomen.pdfIn PDF document text
    • http://lulanjina.net/upload/files/kimovof.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/40kjcm01kn3tc0l5qgqmkckl1u/dumutatikevikesug.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd364e59923---nuxelatox.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bdf1359c57c142218042175023d359e9/nudagowabuvifunigok.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609330161ce47---xotifelusewitumotofigumi.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/58972456383.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97638027904.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/sodise.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/wajanobajojamagizirogis.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/850eb3d83d6f01073e2466565edfe42e/kejifasunof.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kisibawubikajanafer.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/garux.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6dbc7c6ab---jexexonedozeziwimof.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/33857665488.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/nonutew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=topics+for+presentation+for+kidsPDF 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_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 17724 bytes
SHA-256: ed240662c607175b4c6ab2264ae1ec101a9adcc57a72db4975e23687b4e0b2b6
font_01_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FB 10624 bytes
SHA-256: ecabd7d5b55b999f67eb47077976e00436c54051529124e9c232892e4bbfaa73

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