Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4890d1d36b32df…

MALICIOUS

PDF

158.3 KB Created: 2021-07-18 07:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1d60d96a4b2e2b8015f8c1caa38e642c SHA-1: 0ca75bacf002f1ef5b53c19474f564127c060568 SHA-256: 7c4890d1d36b32df791e16a85ce78ea65a7c1754698e6d545af283b1ddc005ad
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0426952b4---19737881167.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b69061f6d---97897734241.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c5d7ca4c74ff79862802305ebe2f5bfc/joputumupareb.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7h29gec4iuv8k9lr9dmudl50f7/zivezukedi.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b1ccaf078---xoxenajezatovakik.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/mitivuni.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/pojefimul.pdfIn PDF document text
    • http://flirdining.com/uploads/files/puvixurulesuj.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/411e9369030c4a8d2d5c7de85c7b1b8e/xidijowawide.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/tinukitod.pdfIn PDF document text
    • http://falerisztika.hu/tmp/30384006890.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/inr8mukqm3jc9iifvcb8htqh3k/58879703178.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32b34f1253---gajegopozetitaged.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/zixiberewovojarox.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aee9616909---30416082855.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/85618ee6142b7b9e28e98205f37fa1f2/701591427.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d655116f25---18227068417.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/5pbjkstkedjj6t1lpv54kg38ht/32834132457.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/cu8bh28n4rmdh69p7ki4vmrfip/36505611244.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/32504022572.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/adbd57129bf1e8e0ff8e8791e97c2b5e/74452775675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sci+hub+todayPDF 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_off0001fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000216ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x216AC 10344 bytes
SHA-256: 21bf9eee2cd48801a0f72e1dd87963141519dbc499de8926716a1fb0437d5a97
font_02_sfnt_off00022e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E2E 24964 bytes
SHA-256: 3b2c377db0b7f56063f92d09a6d68c035169044d420a79a716f145fa96087484

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