Malicious PDF — malware analysis report

Static analysis result for SHA-256 5018c44797abf970…

MALICIOUS

PDF

88.5 KB Created: 2021-07-23 16:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d0903496d9cd574ac8a5ceb3b961244a SHA-1: f1553d8b04509a87583861df8f989cc332cf9c75 SHA-256: 5018c44797abf970afc2eb6291b4eeb45f76c6d3b178c2989deb43106ab019c5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://uitetenindex.nl/images/uploads/14437028734.pdf In PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b6fc7627---34194172991.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dea323a8851---bokiwopaxevuruwuri.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/vozagabab.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c9d4245a8---gagokajopamevolo.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6822d790afff50687a6f9065e1fd5e05/lawosizukitakusif.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/27489273536.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/zofaveborezedonokaxena.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/rebodavufizivorine.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/98625884360.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/kdm2r9vnbmnh2uku7hojha188b/gaxalesokore.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e5089e415e8---28319855890.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/18402287821.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/borixiv.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c47c1514645---lemiwaxabudafekixavobixe.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/noxaxaxugivodasuloseti.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/20416094424.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/91576627710.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/903c662b07ee1f47cd489f3bcc8c341b/diputesezegu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/eg4j3itbko1cqpcephkc2gfqn1/71433563873.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/kuvuboniwodel.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/94cdf2c12520f83441c0f87238b7ef9f/jumolasumuzeburaboxu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/28180396489.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608de77ceba11---tuwofu.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/pififite.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb5a78dab---49926289981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+much+do+d3+volleyball+coaches+makePDF 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_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 11000 bytes
SHA-256: 111f307166337815cecba34174d79939bdc0d89d197c735dba5b507b61ec9536
font_01_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 16904 bytes
SHA-256: 32ca716c467e701fb9999969bfe8a9d6a0a40f74e7890c715e1cd0dd88e6c0a2
font_02_sfnt_off00013c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1