Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca7e330de6320c9…

MALICIOUS

PDF

98.4 KB Created: 2021-07-17 01:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44c861cae44c137be0f4398f16582fb3 SHA-1: dec010ea9752087a3c208fe9231ba2d9f325691d SHA-256: 7ca7e330de6320c919871954f9ebc38e41f93ac039eca224d7e0b760f6ea3618
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files for download. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df981d1366---81537258231.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098b255e49cf---lepasifuguz.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/zagigamebazukoz.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/turenizaxuwubovodino.pdfIn PDF document text
    • http://guchenes.com/d/files/madedidewusiwi.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a5cc8df5a---7443122661.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/92088018278.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608365f29bcd7---rinavesisifopaxu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3f964068d1414a26cedb19c62dd2bfbe/11903685858.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fbddccd5ed98c9c8b0c512796440d6f1/43242566603.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f3a3e8f3---badewoxuf.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/71250136436.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/v37i8pks7qok4vbdpsrk0cn0c3/17203428696.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/jaluvix.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/k5qtl6i5n4q891orn2d58n43dn/44319235206.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/medovapaxezaburefakazufe.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/buzaruz.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/56414909025.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/12846340753.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/575aa3a54dc5625086c30c4c20ef7c7e/rizebipabigipileji.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/82c39b04f90d36cf2b322a35a6e93b98/66806854897.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e41de3edc3---12500469730.pdfIn PDF document text
    • http://charivne.info/images/file/gukulisol.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/99732755041.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c224c20b55a---33505364431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=container+ship+categoriesPDF 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_off00011bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 18076 bytes
SHA-256: 468c768c14f059eff36c9b0bb70a68cf769700f69a4981fe3d71596563359c81
font_02_sfnt_off00016291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16291 10636 bytes
SHA-256: f956780bfd119eaa9e2db0e64dc499cbb07bad05f53bddde0a9123b3f79542e1

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