Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50beafdd4098019…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 19:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c24b58fe9698e1f8788eccc81caea2e5 SHA-1: c98ee4788524005bd5862e5dbe4b79b2fbde3686 SHA-256: b50beafdd409801931b0936ef7912b2a64077694190d3e5851f98065e07e7548
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm or distribution point for malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests it's intended to lure users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd83d25a7dd---18349010262.pdf In PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075eeefe2e49---45441558072.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/5739396402.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8694c02714---jiragujakofi.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/gikazod.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/8b0503ad29609919ed2def3e1b54fdcc/gupijaguliloru.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c306302a736---jurosakodozugatikeve.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/serafapit.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/75763985914.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/nezufimaxu.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/721272679.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/ganojova.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/fuxekukidukubiboxafebi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca54e8587---21079418231.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/wolinemimame.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/vunidiwujepamojomusetegef.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/14593628604.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/10644093410.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1fb0ce3682e63658e455bf88ef02c19f/42892759683.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078efb8cab71---73499674959.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16115c92f28069---sedorixorosog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rational+numbers+worksheet+for+class+7+cbsePDF 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_off0000bd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD29 16688 bytes
SHA-256: 89e7ce2158d31f4f1338d729726374ff76dc5a773222503787329a821c03c9a2
font_01_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 11112 bytes
SHA-256: d23a110a67d2e04c723e1f7f6259d7a7f7a9d794ac498488429fb293ba45c714

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