Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4adfa27aed21509…

MALICIOUS

PDF

90.0 KB Created: 2021-07-21 18:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29d8aa1282acd28f43f6d55f916784e0 SHA-1: 9897ce10ac0ae37c8087eb57a89727b347d7d6cc SHA-256: b4adfa27aed2150966a62e7528602e779b9ae2733b9f3cb780805d3916d58305
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lead users to phishing pages or download further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3254db969---kenebegifamuzipesaguwovot.pdf In PDF document text
    • https://nada70.org/userfiles/file/74674975189.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/viman.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/pqssveao10u8mjd1a2go6qlm94/30722735084.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/85d4d9125818a8f76c86a329ae78007b/malezemu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/494920da21dbcbe16626a2dba5282ab1/zakejiradi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606da53751dc2---ximivune.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/7600988678.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/4469653665.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d00766a5---84415967242.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/niritatexuzekenu.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/25381426662.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/vutadobovukifotidubog.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/59226386105.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c0efee8544f---gezetovizadas.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899a8eda8aa---29861555060.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/moxarexatelevuxivunek.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c000ac100---21609363377.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/diwilewitafitaboje.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/eod31dcrurjq9kmjhuqik1job4/87472760432.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/xuzuvajozaxumaz.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bed3e9743---zasarupoforikonodegum.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/7694753040.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/51f711c89046d8544578c813222df678/7185754355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=this+country+mandyPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/54b026c8457951a1f892836bc104a239/veritefapizata.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_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 10636 bytes
SHA-256: 80f8aac19017e8cbaf15b1e4a2cab743b0d97e6971c804e95ece820283f015e3
font_01_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 18356 bytes
SHA-256: eb8d223209f5b1132a3f08381200b78503ef3ce7db2f8524b68278b29650f06d
font_02_sfnt_off00014140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1