Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76d31027fcfc35a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-03 02:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f56114b4644dd8c021eaf8a8ce06639c SHA-1: 95ec1fd7759adebd833104fda0b492bdc2a89d70 SHA-256: f76d31027fcfc35a36ed7523117cc2fd6f486a3b54c40a6effe0e10c65288604
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The 'utm_term' parameter in one URL indicates a lure related to academic search results. ClamAV and ML classifiers strongly indicate malicious content, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=cell+biology+and+genetics+s+chand+pdf+free+download PDF link annotation
    • https://promaxsuspension.com/csmimage/file/58769994081.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/vonemesofo.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/famusetijulo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dg1booq8efhj9vsbgcpfopdsru/95843335169.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/43458316823.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/81530126788.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/mudisiwunadudedipadujus.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096d9c7e8e19---88792376027.pdfIn PDF document text
    • http://lhsclassof77.com/clients/34792/File/27040979295.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/temefovitowaxo.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/39560489931.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210609_0E8286F9D3F75DE0.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/34775585336.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/s9t3cp5voemuufphg374adninb/tofenot.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c940f120186---solubelalakuvomopovi.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/sezixifuvuvutimogekikufe.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/59996278881.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/0942e9217b5060e98fbaa53081b8d3b2/sibozoxemazasamirenofigaz.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/49334505067.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6520e35d---66001831434.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/fesobixifojozogikuz.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/96902611504.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/71143519628.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_off0000c845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 19620 bytes
SHA-256: 268974fd2167e93b568a8cc00577a3bf14c22aeba1fecf9d330437eae625f9e7
font_01_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 11268 bytes
SHA-256: 9031c307404c4c1ca31948dea7d67ac29fb4345d1486737d39373590c68570e5
font_02_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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