Malicious PDF — malware analysis report

Static analysis result for SHA-256 765370bb01b8259a…

MALICIOUS

PDF

98.5 KB Created: 2021-06-29 22:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9bb3206f03fcd0aeb9f9779d9c1c6775 SHA-1: 7b5e05ef62f6e72fd82bcd7d1656915925dfeccb SHA-256: 765370bb01b8259a57721b2504866a7322aa5b7a84b5bd73252bbcecb069fe0d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various websites, many of which appear to be hosted on compromised WordPress installations or disposable domains. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://archism.ru/uplcv?utm_term=part+time+professor+salary PDF link annotation
    • http://jrmhandling.nl/upload/file/veluwi.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/0fe14e13095d3bdca6a9b69d8986193d/6254314740.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/jimixolegegonorifevowi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a64dd29d30e---97467073705.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adc7bc67dbd---8589704194.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0358e654dfcd07799083934030548798/zejupikonapetuxot.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/30989225873.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c2bf48a78---dufukefutomuxofonuliv.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/luwuguwuzemuzi.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/32153387190.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/soredexujogeloloku.pdfIn PDF document text
    • https://andrejc.si/files/file/11531766620.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/93dd16fa3ffbd554c902d930f0779cd8/sugijexeresuz.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9427a0b720---56834921169.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6385a4e48362af765755cd47f7aaf6c4/dabejuw.pdfIn PDF document text
    • http://zae.me/datafiles/file/meveja.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/12337018777.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/jcihhijmdtkrjub2ae7fon5pf2/nokeboseturonoru.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/79623471518.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7906f538ff---warusebonekoresu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/81a3457f79ed7e8df42ac54cfbb472e5/xuwipi.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/78376370969.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607d583cf41b2---lodiguvigobunisaga.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_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 10528 bytes
SHA-256: 00a40a8a99141ce0115151dca057c390e320be21d017081a5f61c4abdbbc0cd1
font_01_sfnt_off000135dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEF 17728 bytes
SHA-256: 4a7b7fd58534a68ca4b026b3bfadb99c59a74d57bfdf9707a0bb19b0621a7895

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