Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4d467ca365bfa8…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 13:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf0dd285eb8430590f73f3599cb5d07a SHA-1: 00bd4cec8000d8dca85568b5d75c145f62892d4c SHA-256: da4d467ca365bfa844868d8ca58940d7da0d8eadea00893ea16ee7d2e392a0fa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised websites. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic suggest a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cwpni.com/userData/ebizro_board/file/21488444842.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d12228d08c---dunani.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4cf7755c7---96948668835.pdfIn PDF document text
    • http://alefart.ru/admin/ckfinder/userfiles/files/nexodijufi.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/liveneruj.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/77109107666.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/96958477195.pdfIn PDF document text
    • http://aqgwegfjdlk.handyfriendship.com/upload/files/getajovemij.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/31878508293.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/noximode.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091820143673499.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sirudapedol.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/baxojitopananozimagab.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/rezizuxunujejonafa.pdfIn PDF document text
    • http://posuni.com/userfiles/file/dogasiwovasuxigenugux.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/beziruwifowes.pdfIn PDF document text
    • http://imprezka.2kc.pl/Upload/file/mudafetexijapodegumuno.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/30655799765.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/lurumuk.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/20494008b857baf3f41b549d43e316ac/5169741338.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/41206963770.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/93291079627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tor+browser+for+android+apk+downloadPDF 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_off0000ad88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59F 10672 bytes
SHA-256: b7a90ae883876ebcfba26de3c6c39d7f35ac96a9858eb926991d0777a4c0791d
font_02_sfnt_off0000de03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 17208 bytes
SHA-256: fb95454b852e573feabeb8dbc8de39cecfd6ed6b89b531e950ac22ec08d1975e

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