Malicious PDF — malware analysis report

Static analysis result for SHA-256 d996db009d9eeda5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 12:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2076c5439367326d93f5e1e5fb4bb423 SHA-1: 97086ed0a27a7f38839f42d12ec5b9a7414986fd SHA-256: d996db009d9eeda579c680ff3867bb523064b6f8be682cfb2653ba9ea4066367
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm heuristic indicate a pattern of using compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wirheiraten.de/images/file/31910218149.pdf In PDF document text
    • http://bmsorganica.com/userfiles/file/16894056480.pdfIn PDF document text
    • https://panama4d.com/contents/files/14516488177.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///nidanupejusetusakog.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc8ac5d14---8908197332.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/13952053637.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/voradilapetazirega.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/20ead6997d9c9a899b220cc3b827b8df/fivaresuxatojipizumujigo.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/84028957680.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/492f71b1e55f751a64323e7722e9512c/6289929498.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/54432846648.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/wutifoxukujo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2ff8ad77---69136812700.pdfIn PDF document text
    • https://soechi.net/userfiles/file/xibobabomagapenuwamutaman.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/49313064653.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/51824555098.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9e07bf96efc5c184e4c321e4a22ed111/34624493831.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/75235946484.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/fenig.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/zazudalikun.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/jegozokiwesetufipam.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/cbc9ddc671626862043345bacb8a7844/gobivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=uniform+circular+motion+worksheet+1PDF 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_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 19004 bytes
SHA-256: a218194b4067b392a3cdffb86146ac5af1f1fd158d7c8413647e01dfa1a99f33
font_01_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 10940 bytes
SHA-256: 5514737d106658c80fae38f0662d6fadae305c1d8524c92a308c8a9e9723ba1c
font_02_sfnt_off0001213e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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