Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6046722b99a41c…

MALICIOUS

PDF

87.3 KB Created: 2021-09-16 12:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b4f09b596db94c6fca56b2002dee193 SHA-1: 74d88c930046eb13f60c1994bf65d5ae5394dd77 SHA-256: 5d6046722b99a41c028ee2aab5636094b85ee148e6a475a10f0ce6fb5e7efbad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the ClamAV detection strongly indicate a phishing or malware distribution attempt.

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://laborke.ru/uplcv?utm_term=android+mover+app+para+sd PDF link annotation
    • http://masan315.net/board/imagefile/file/48115669166.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/69463621938.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/47143218433.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/sinerudaxegenupomazas.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ba3bdaf0d---lilolagifujilidaz.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/dajusiwamolize.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/nateja.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161305aab891f1---fimimezodixanazubeva.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/40137928168.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/kovesafawepili.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/sozaziwuvakawamijolema.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134608255e33---54983076565.pdfIn PDF document text
    • http://balone.net/_upload/file///10016182213.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/31941926836.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/855676269.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca20d026dc---wifobiv.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/kafipamazi.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/74273233442.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/binukaxusajajowomiwa.pdfIn PDF document text
    • https://yasacompany.com/upload/files/junewikaguxu.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907092404876875.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161430d71ad197---mavizefezaw.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/katigapojimokimalazin.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/kujebobeto.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_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 10456 bytes
SHA-256: 9003cd379984edd771076ab82792a76bf686f6f130ccf0aac7be097f8fd98496
font_01_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 19296 bytes
SHA-256: 5c2697ba927152e735fb3b57ed70be184bf96eacf53c6953d0bc65e1aecf3af4
font_02_sfnt_off000137ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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