Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55a8c72c8a879e7…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 21:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7f1f095945bf6691714585674cc5fa94 SHA-1: fc7760adeec3b8d62d26864674a03b0354ed656d SHA-256: a55a8c72c8a879e7e414addbfedf1f6c09452526d14ae3bbf4d179479e9fbf55
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a callback phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content or engage them in a social engineering scheme. The presence of multiple links to compromised CMS uploads and disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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) 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://architetturaurbanistica.it/userfiles/files/25349014391.pdf In PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/bomodad.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/14705334017.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/nizebuzuzolebilabeta.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f720ec16d1036794a4cd0de30768402/59995334082.pdfIn PDF document text
    • http://dsagco.com/Upload/file/50181666486.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161392aeeb3961---65312513427.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/21809923095.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/34297254191.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/jupibepamegapona.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ahqc6je5ec0edhnqf5tf6thrvh/jasodad.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/95618205048.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/pizozazuwuzonilekibiw.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/74131107022.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c07ec537ae---gigupunerojodesuna.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135337bcb568---73247661929.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/6795798112.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/98075240201.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/77482394133.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/12140882845.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/tagorilalu.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/tiwola.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109060930567443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+recover+factory+reset+androidPDF 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_off0000d049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 10680 bytes
SHA-256: 4f7dc84dcd8d4e7f6d030f7c215388467bd74eb6501e284343201d79107d5728
font_02_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 19352 bytes
SHA-256: 53f1b760d936e001973c52665989e2c4825da0cedbf09dfa79d28f5c03c3feb9

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