Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa93f1acbf4f900…

MALICIOUS

PDF

100.6 KB Created: 2021-07-14 09:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4323254685cad3262355477c570f03a0 SHA-1: 8360294ea76be3d3438273ce49f5db2e1ecc22f2 SHA-256: faa93f1acbf4f9001db3c6e4494a566bd4c2180be41651fe156f0503a757852d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://podiummoda.ru/userfiles/file/85809674124.pdf In PDF document text
    • http://qlinairnv.be/userfiles/file/97988304858.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cff9f88c9f---10638601654.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608693a2c45ef---sunizivarike.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/xedalotufowabi.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/puvanipenewa.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca4914911---8410714076.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/tamusok.pdfIn PDF document text
    • http://goref.ru/files/file/48334993159.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/fotan.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/0facjdcb1620cl5f1t85e0osp6/297140473.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/tawofagimevila.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6649dee316---46650939267.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba36671e5ee---68257085715.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/kazebilepegiko.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b125f754---widil.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3f2a932ee---sigalifuripized.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/roliwis.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/9211763368.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/34388661039.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d6fba0740---1785357142.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/24a44738c51c09b30213c3f9fb0a8fec/fukadumev.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/b9l5ohgdehpeq5a0phogc8s2rr/pisubevemoso.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/186ccfe278a8bce36548fbed235bc9d0/jusapikitukolipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pounds+per+square+inch+to+pascalsPDF 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_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 18280 bytes
SHA-256: 48be70331d599e15dec0111dbf8f76a94151121a999ec9535cfa7e6dae89e0ac
font_01_sfnt_off0001528c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528C 10860 bytes
SHA-256: ec29ef38131875289a227aa05c43bcf39142c8a73d74b3760c0c195cbff94915
font_02_sfnt_off00016b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1