Malicious PDF — malware analysis report

Static analysis result for SHA-256 147f6f09bd801c31…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 00:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f3f69825e23751b9e92e16b4be7bb00c SHA-1: 7604a476735be8ceb5b18031f942a0ccee76334e SHA-256: 147f6f09bd801c317b67e1bdbc24f906f2e1c4aa168d338e75b73fc6e43083ef
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The sample leverages compromised WordPress upload storage for hosting some of its links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=android+create+shortcut+to+file PDF link annotation
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59a901fff---jamagakaw.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/34289951978.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/muvitufebodojedetizolexi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613788e2c059a---79164021500.pdfIn PDF document text
    • http://hanauhrova.cz/files/6625956510.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0fade198f3ee6b064c9068560491cb88/velabiket.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/rowetoj.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/zirefuxurakej.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16141474baf3d6---91500006534.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/dadilisez.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/sewud.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/lamegizenipezobajijafu.pdfIn PDF document text
    • http://megalaserasia.com/upload///4004358443.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/79911010419.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/61650155601.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/48901930066.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/7117716522.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/kifekugojanusinusagi.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/3794702628.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c22ddf1baa---deviwebapo.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/4103331521.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ac0eb1c9f2f018debee48f18bd55b50f/730842105.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613952ebb8fb6---guwusawaf.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_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 10652 bytes
SHA-256: 9b2bd49f9c0186a9084e3d6f198bb088778a553065b5730f571f96f05c3d859f
font_01_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 18248 bytes
SHA-256: b3300c7f5364545e97e1be85138818b7275ce4bfb2c7763eb58ab1fef5066851
font_02_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1