Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3e8da4f5562fe1…

MALICIOUS

PDF

90.4 KB Created: 2021-09-02 16:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca28efc1c3ac6f088d410b649e34a59e SHA-1: 4648606494ba7fe5cf810d9bbf78c8093283eda7 SHA-256: 5b3e8da4f5562fe117301567c572892aa9865248a6f9d791fadede9a91ee9f30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing infrastructure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to manipulate search engine results or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=copywriter+handbook+pdf+free+download PDF link annotation
    • http://gocoachfox.com/userfiles/file/27389963789.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e55c203eadd7dba185ecbdae44f843b3/dokupevizidakikokan.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/wobik.pdfIn PDF document text
    • https://mfdesign.hu/files/file/6943649648.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5042a4b42fad8accf74f9aa8904d1acb/53652296099.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/fujudate.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f2574b2f---58222111971.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b456c24143e---zubize.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090c06457249---duvidunuziloxikifugog.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cdploqq95rnihnmo7q5gesbso6/24754583348.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/53f5e1bb8a2f8c9e74a1c02cd71842e4/67276686737.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/31238022854.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/50248304855.pdfIn PDF document text
    • https://adikketiga.com/contents//files/19532591523.pdfIn PDF document text
    • http://domuran.pl/files/file/dafidak.pdfIn PDF document text
    • http://keramann.ru/uploads/files/3084636674.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/sejuxuvefinijuxebiz.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ae3e46258---37283072693.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/26483282511.pdfIn PDF document text
    • http://beijingteye.com/upload/files/gapotixarig.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f374651c226---43811514143.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5976e29877---97238562313.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/53367695832.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f89af3e3a15704451691ef5c542bc871/negoruwib.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_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 10888 bytes
SHA-256: 7db01d4dbf36aa52d30e041ac191ea743a43961e402f96759eb75dbb1ebe9da5
font_01_sfnt_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 18716 bytes
SHA-256: 820ba47b6dc2403ad281c65e32dfd39492c8be61f3b59163ebd98578a16fa25c
font_02_sfnt_off00014413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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