Malicious PDF — malware analysis report

Static analysis result for SHA-256 456cafc5c636bcf6…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 23:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9f1d70d06562accc5f2ad3d708588a6 SHA-1: b28739f7645e36a590ba21fe82a0c3fedc955eec SHA-256: 456cafc5c636bcf6c70651c741c3f1ec4191659750346c9b38d3ce2f50f4e96f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other potentially malicious URLs. The document's structure and heuristics suggest it's designed as a callback phishing lure, prompting users to call a number in a context of billing, refund, or security issues.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://solartgaleria.hu/images/file/tunarorese.pdf In PDF document text
    • https://dortmundpools.com/contents/files/duzitobuvawawu.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/96102649795.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/nebopujifupusuzujal.pdfIn PDF document text
    • http://yanartextil.com/firma/files/nokozir.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/togarofom.pdfIn PDF document text
    • http://besteva.com/upload/files/35049497772.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210910_4B68949D83AEC664.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/lujepe.pdfIn PDF document text
    • http://btfa.tw/upload/files/62690077240.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/89801942566.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/66601926554.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/rirefizeretujile.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/72381291634.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336d81573c8---durujoridirite.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/52460601257.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b96f2a47a---figijezukujavuxiduvak.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/13541383898.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/27c65faad5185e8696a6fb1bf8d15d61/31379165705.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/93929473408.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/59691686506.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/zonogilakodadem.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/65074560227.pdfIn PDF document text
    • http://rapet.hu/files/60619207304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cast+from+ipad+to+firestickPDF 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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10756 bytes
SHA-256: 46250a184cef73e72fb73a63ef24500616f6e3f40ebd3df8e7a47e3367374ef4
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 18468 bytes
SHA-256: ab5110b36cfa379ba9ffe6395c8015f075f22a78698672ce3ee02eb086d2930e

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