Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2a91a902f90cf4…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 10:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ae0dc63c790a730d8d75c5633ddf4e3 SHA-1: 65e909f57d32f69ccebf278603bed22280b5f05e SHA-256: 7a2a91a902f90cf43bead268f53e8f8846ea01df1e500fec9fe0d0627c8c084e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing a link farm pointing to various compromised websites, likely intended to trick users into downloading further malicious content. Heuristics indicate it's a callback phishing lure and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://chcial.ru/uplcv?utm_term=genki+3+textbook+pdf PDF link annotation
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9aa1dfc2---40209128932.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/pezonezulobatakugukix.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/97890878697.pdfIn PDF document text
    • http://www.520amis.com/upload/files/xikolafadu.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/49868846540.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/43449225409.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/19766897969.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/84738125293.pdfIn PDF document text
    • http://innotack.com/userfiles/file/pazanovavakesa.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/jezumigokagumaj.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/mulepum.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/rabogireba.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/34973015139.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/dapew.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/93264110657.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/89180853746.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/62688937278.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/9604366175.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/pumazosubelokof.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3b894bc81---89442690059.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/fivopo.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/75452401334.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd42779cd8---daxanomufedajogevamuk.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/bebodogobam.pdfIn PDF document text
    • 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_off0000b335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB335 17040 bytes
SHA-256: bf0ea6c8fad65d68c5e94c1a91fbfbee08ab3c44e6d9be39087908252f13f7f1
font_01_sfnt_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 10560 bytes
SHA-256: b5996267f2f79596d14b6ad1e523dd05bb9bd50a4434f7b41744deded8ede52e

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