Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d4a7a0b52f27af…

MALICIOUS

PDF

78.8 KB Created: 2021-09-10 19:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a41fe16d7cd35bc022d0484a7b6450c SHA-1: 50ca0fa80ac79cbb9d47c822adfbdea6643b05db SHA-256: 56d4a7a0b52f27af276f83f3019052bd79a1ad5693bea9f709e5f745c556ee15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the document structure itself is indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://richmediahouse.com/admin/uploads/file/jixet.pdf In PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/45420457254.pdfIn PDF document text
    • http://cascad-trans.ru/files/wumusogisofabusukotonix.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/48791289868.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/gawesoxo.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/94193636391.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/repabipuwazelubarowodir.pdfIn PDF document text
    • http://www.polni.si/Images/files/36922095298.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/lagogesukorirozopamijo.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/43315402280.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62a541f35c6b99e61addcef8f0a5a627/gatebebilozi.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/32946458234.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/tanovagalewomunanuf.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/30390147630.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/pujawivesatep.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/77045522266.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/lugikujalunab.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/38131122638.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/80483800833.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/edaae4502786b5d72001055955044f3a/zikaxiruniligo.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/tozeb.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109040120523572.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138e56e50deb---86841231703.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/sizabeluvepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+set+a+reminder+on+an+android+phonePDF 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_off0000cf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 17600 bytes
SHA-256: 81d88e28dc2d1ef8f3fc9fd76227098c58de1e42a47b7b0ae460bc65a06df69a
font_01_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 10688 bytes
SHA-256: e81aea4f20dbd0cde31fcc276f8efdced759ea5669570f304b53f5da4adddcd9

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