Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c58565e0e02cc69…

MALICIOUS

PDF

91.5 KB Created: 2021-08-17 15:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb2826ae1e704abfa17da40c7b5a3fff SHA-1: 5bf5fc344bdd06c6b4858e9d06d331929f72e829 SHA-256: 7c58565e0e02cc69d0fad68df96601e9d50fedeadbd940cebf74c70678568ac4
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. While no scripts were extracted, the extensive use of external links and the nature of the heuristics point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://catamma.ru/uplcv?utm_term=different+types+of+ishihara+plates PDF link annotation
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/vjf54ciu1jpq8qdmhtd3jvv02b/gejalozopedisabewosunejo.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/26c847a028b50a8d305029ed6dbd88ce/folipebuburuwaderi.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/25337929274.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/52334497346.pdfIn PDF document text
    • http://didopack.com/files/xenufed.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/99647790925.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/zafagujotemisu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mevv8klegn2iaekia42frvuosa/kodej.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/zotifemexevudugavowuge.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/jadarebenawewu.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087c22c2a8e3---webebonuniguz.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d2612c52---35305553180.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/427f3bd06ac5625d2c2404b991e59c6f/55220759687.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1824d869c---lixizaf.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/029c9c83ab93e0c00d8704329106e549/76751300469.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/xopalolasosilinejozok.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089888933f0a---baxekoju.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/n9cq49044gvcnl7j4l71ephvt5/25585009747.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/27339873118.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/pilatusibiremabiwifinirop.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed092d37b---91313100304.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/4620109835.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/12477310969.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/tewidaxagunusaxadi.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/68549092007.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/tuzitoxod.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_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 10572 bytes
SHA-256: e8e890ea21cba053166af7cd085fb64e0d4f97ee333d38b2db83727a0b00598e
font_01_sfnt_off00011b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B57 16832 bytes
SHA-256: 6fb9c93ee762bedad9ef996c42b5335127a65ce0aecf5eaa62869f87306a7297
font_02_sfnt_off00014748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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