Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ddccda2a72f05c…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 10:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 86d79c838400ec8863603e1fcc45886f SHA-1: cfdcb473c368e29fc3b81991abe19d3d4142cfe3 SHA-256: c4ddccda2a72f05c2beb9465ad24010dfe532e0afed760a4551d806afbffee85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://anthonygillant.com/userfiles/file/genekatekazifumuxok.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cdf0ae535e---74720568410.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/romasapotexok.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/14439735753.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/160cbc902ef088b4ee2d13c707ae4e2c/tivaxewer.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/855794264.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ce83a647---15643349987.pdfIn PDF document text
    • http://finchamauto.com/pics/79689024254.pdfIn PDF document text
    • https://amblamy.ee/upload/file/16341726780.pdfIn PDF document text
    • http://freeski.hu/freeski/file/54500651689.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/bameluzuvakib.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/20930617439.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4145067cd6---jabunoje.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/29158916547.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/77f1c3a6bffd293f468a01d9591691e7/12620816100.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b59d6a96f04---xipovixipeja.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/20442908045.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/gozunebogetoli.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fde5d1e9a93---34187964067.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/zujopunufaduwifewasid.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/31584990079.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/50459373633.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/kovoratamanavapegabuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tertiary+studies+definitionPDF 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_off0000ce6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 17168 bytes
SHA-256: 2dbfb0ca51f53760a03719a156bd16bd401ee8c4320bcbd256b0ab24421df385
font_01_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11306 10476 bytes
SHA-256: 7bffb5d9fa638d1c3079cc3e6c9327998bd4e389d9753fbae6362d9d29aa8e40

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