Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f0cdc03b529ffd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 22:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd9bbe1bcef163583103c29e5aec0333 SHA-1: 21eec22332c5ed98fc1cfc6cf6fd196d1803c949 SHA-256: 84f0cdc03b529ffdd7d311fc33f767b532975bbc883c460479dcf010f1b0738b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971fa877834---75204980433.pdf In PDF document text
    • http://dok-vo.ru/userfiles/file/75064392078.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5db60c54c50310b0c6d3103771ac505e/pamirojenukikatagifez.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/kefuzovafefufuvewu.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/50916363789.pdfIn PDF document text
    • https://dm288.com/slicice/file/libijopi.pdfIn PDF document text
    • https://bonacorsi.it/file/49657439199.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126891d62a47---51116079115.pdfIn PDF document text
    • https://unosms.us/userfiles/file/golebonusuwumoxusizogunes.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf188de6c8---69837959677.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b8e09760---vufomulu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095735add3b2---puvesijutepamoravidivewi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qu422tbhqfqadq5ebj1sqpatmo/miram.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/nevupavegobemadef.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61e21c02f1---viwisilezevav.pdfIn PDF document text
    • http://sbairs.com/datas/files/86691656383.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/kusijuwutafexadinuxinoluv.pdfIn PDF document text
    • https://stopserv.ru/files/file/mepibiwoxaganedir.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/zufijozedipekatuvigi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93c0ce791d---78903285604.pdfIn PDF document text
    • http://packturf.fr/files/60713513994.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/kegupojodi.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/xoxabuwakotijegiwabobu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/89c4c7517a0d0ca56142aa7f187ec7f4/xanogomofolivezedules.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+names+of+jehovah+and+their+meanings+pdfPDF 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_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 11056 bytes
SHA-256: 7e31a77f93834b98dc42caad7bdafee5f37368649a5b06641c3496050154e517
font_01_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 17048 bytes
SHA-256: 007df58f16ae6d13de86538a562d8a48a85aec028496923a045ff8a74e4193d6
font_02_sfnt_off00011bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1