Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af53f9c871fa583…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 16:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9bc3131d56b0b3c7c59b08ecf76d5b4c SHA-1: ff3b2aec73c89c17f3e2d2cb0a1b48a3e67f37fa SHA-256: 0af53f9c871fa583cb3ddc13523823e59350716ec4b530dd53a7685b2e32f1d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack, likely involving phishing or malware distribution through these hosted PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0fcf003985874721af4945888205f2bb/28827269577.pdf In PDF document text
    • http://ownlines.com/upfiles/file/82920888405.pdfIn PDF document text
    • http://kahasat.cz/data/file/viwekibubasa.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e210a9bb2c2---96836464234.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/zuxebijoserasawikobi.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/qf2g6p4h5ahg9vo2ul4ejibra2/wonor.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/21675084892.pdfIn PDF document text
    • http://mav-auto.ru/images/file/defogitilitosadupimojazi.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/36196509457.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/91422397043.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/60663908887.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/mufewijufadufeb.pdfIn PDF document text
    • http://turatabor.hu/media/40572350757.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5aa6792130---46884059697.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b74997700---59107548893.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/wezemoweriratiwegemem.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/9602295981.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/8944507567.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/xetiranavagutuzamebab.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/1302ce03e49ad13cd03a6baa2ca3f788/kizeteroxuporato.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/36c6e61195d308f359cb60a48eb00527/vekisisujetameruduk.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a0c4e1308a0cc13a3ed278e4830b8825/jobuxuzelonunavafeted.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=types+of+insect+mouthparts+pdfPDF 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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 17696 bytes
SHA-256: a13d33a50e2cfc968b2c05c50ec6b2db1caf0bf64eaf10873902b563e65c97ea
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDE 11016 bytes
SHA-256: 20271126ad4b0aba6a9790244d5ab35909632e254689b2c2b08c89b16f7c3e99

Open this report in the interactive analyzer, or submit your own file for analysis.