Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d1a72f84378a43…

MALICIOUS

PDF

88.9 KB Created: 2021-09-08 01:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b0a50031788690923a426dfdcb510ad SHA-1: 938be14c928cb9bbff1163bcf23c16f41e3c159f SHA-256: 65d1a72f84378a43a03a7d2cf0fefd9237f815d2e978d4fa04ba643658bd92d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=exponential+and+logarithmic+functions+problems+and+solutions+pdf PDF link annotation
    • http://deauville.ru/files/file/88042875885.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/23909179455.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5af90bdb55---11652296639.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/waduvujolofixikomagulugow.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/xatiwok.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/49159497035.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/65ne6rgk050sa7rndv877nhr4g/54290925922.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/dobemotatogovotagem.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/pilofufaxipafagod.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/lokedepivapuxuxoripuwafe.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0dad7088f---vodebexeritipomonano.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/44555209323.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de34ca869f---zogupafomukonu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9fab18236b88cfc72fc69042a185debf/61003776204.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/41009758821.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/97052548750.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/kotofuzazes.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/42486788409.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/gorutuvutadum.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee3399bae3---31142698902.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/32vd6ddshftdsimk1873esjec6/67587080490.pdfIn PDF document text
    • https://bloomeng.com/uploads/72282184336.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/bakakisuko.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/wunamib.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_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 19092 bytes
SHA-256: 6d51fadeae2f77774f4b2a1f4be9fc4a5173f86018b6b6fc5d01b24e8a3876fc
font_01_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABA 11392 bytes
SHA-256: 2173887d01bebd77d958e704de8cdaa801da319ec21a3dcf463a493b1b17a801

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