Malicious PDF — malware analysis report

Static analysis result for SHA-256 06707c90e0ed0fa1…

MALICIOUS

PDF

94.8 KB Created: 2021-08-08 15:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5c94bba3e10e95f7919ec253c73b937 SHA-1: 70a4bba8983de48862e6c0f247ce81af7bb17dc2 SHA-256: 06707c90e0ed0fa1807a38c53aa81a64a9622601d3eeebd4d1cc235fec22e57b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://infrive.ru/uplcv?utm_term=how+to+share+excel+file+for+multiple+users+2017 PDF link annotation
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160e680eae184f---29317534615.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bca5e83138---welusifija.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/59603851859.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/70063857864.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160765474312ab---tuwojumizinujawemegut.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebaa69d4c5---91731764018.pdfIn PDF document text
    • https://wagaskar.com/media/97651873203.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/woloxosuxeku.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/kesimodetivutajovebilav.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092ed92a7a28---tomepazeluruxugalinilus.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/20393093223.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/37930821022.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/mabitod.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18eda6718---tuwojuvozabotexok.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xipus.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/90853139705.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5am4cm5sie7aqplu26omi4o0o6/balan.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210629_D1AC540096351387.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/gifarevesenikibawobalom.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a660d2b5e---29444836171.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085a66c3d486---xomaninitonaribik.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/56772077246.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_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 17348 bytes
SHA-256: 137cd3080eae834d8cd0098cfea41a8fb894976bcec460ce9d7a4dace070379a
font_01_sfnt_off00013956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 11264 bytes
SHA-256: 35b7241c2a4e3e63d8e451af56db81ab1aa5c6271622e930f4888623bb9aa29f
font_02_sfnt_off000153f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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