Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc940a60506ab63…

MALICIOUS

PDF

86.1 KB Created: 2021-09-12 21:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f65e6b304fdb021441c0f7a50885831c SHA-1: cefb2e5c64b9558e5be503d4547b64d69edebeb7 SHA-256: afc940a60506ab6345a2716ce18d377db2466ecfbeff70861c1b5e7408aaeaab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.domaine-vrignaud.com/ckfinder/userfiles/files/87636363435.pdf In PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/92540711811.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b8c7a1160---mofoj.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/53670678675.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/9116392197.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/32293055309.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/wijutavegibupazijiramo.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/gutumovofeferizefafap.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/fovasa.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/60094389071.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/bowuratuzap.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161395ff56cf52---morij.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/37459790742.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/wobolivunu.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/tisanuloz.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/60622444353.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/sakigodug.pdfIn PDF document text
    • https://limsurempat.com/contents/files/wapidugirirexo.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kb64ffv6v06d7h5pis83oe56nj/wavuvi.pdfIn PDF document text
    • https://zzwgjx.com/d/files/kenudefogadipiwadav.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/tamofakopujusonobote.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/sogurinifizofokulijesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=find+my+phone+imei+noPDF 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_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 10176 bytes
SHA-256: 8b7628fa97f35545734546e0015cfcf9d0d1e0295262f58bc9b021e84e095e9c
font_01_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 17804 bytes
SHA-256: 858a63d5b3323f3001f33138222d3351cfa4d16e9a9cf8580d2a1b815e4fe46b
font_02_sfnt_off000132c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1