Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a151b72c629e33…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 04:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b26df7cee74080415b2a465e6b262d42 SHA-1: ac165674d399c239a128490e450b80f3b4189b55 SHA-256: 62a151b72c629e3335a639b9860546a1f5bdf838b6cda22c342037a34f5e7267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a redirection mechanism for malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=leadership+challenge+workshop+facilitator%27s+guide+pdf PDF link annotation
    • http://an-ocn.ru/ckfinder/userfiles/files/wogixok.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/29501131736.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/d2911unktdebu0djl5dv8dql66/78740734478.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/worug.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088cdd5b896e---fupagidemavozivuti.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/42329373384.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/pufemotufimalagare.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/98865310102.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075b823d6329---85788176299.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/luvejujeditim.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7e5acdb1ef8103fc9d0555550b670815/zesurodopejix.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/acb130239ebd6f72f21669775747b130/14110872207.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8c158880---pukinavamukojepidobas.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e460540be1---bilaselifimesugesag.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/68577595416.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/31846959966.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/04a2a6445d2c2db506fd1a86b51add1f/29554659306.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/gozejelovalujir.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/83928454192.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/82759880642.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110d5f9c3a27---58720926972.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/dapem.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_off0000b46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46B 11168 bytes
SHA-256: 46ed69f76963a4319289c74171e1f1d0c52c005305a230ad50fc18469d7adf80
font_01_sfnt_off0000ce59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE59 16668 bytes
SHA-256: 4de1c8c12fd083b4b932529f80fa893d88fad589998d6c67efb7d99e4485c9fa
font_02_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1