Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5ad586e23e0abf…

MALICIOUS

PDF

102.2 KB Created: 2021-07-24 11:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8f9173aecdfdf3b6e23d6198981c10d SHA-1: 31be73390840dd618118edaa838ba75bc5370844 SHA-256: 1b5ad586e23e0abf22c5ba5cf5cc9a2aa23ee3df79e81491b0ecc3cc9612515a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a trojan. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://betentour.com/sites/default/files/file/kemaputozez.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768dcb134f6---wubinibividapakujuzetume.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/fegoliwufajenen.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/fusokoxagudegedewibi.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/vodudu.pdfIn PDF document text
    • http://protok.pro/upload/files/baraxuzubobubavobizow.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/kalukiririzukekolako.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac0d45879---sigifujalavemigonuworaxi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/gopetijoben.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/ximote.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe23bd215c---zujoziturafuwepivilulita.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e838ab824c---99683157110.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210605105244.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/30500246909.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/thcigjuuaef85o1crnjfmbk7d0/vexabitenigisoki.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d44cdb001---javopugugilivubofuxafow.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a51f45be2---14047565444.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/kelaze.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607186d74f118---59701109002.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/acfdfcebad8aa59a1d4d6aa47a5e5487/94869405689.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/lofeboxufujejemevusemo.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/e0517f4e9dd697aec79b402d75247c90/75271857751.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/85049010811.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/e7758dbad98368f1c9c84b1a014c91b1/29664977002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=us+military+field+manuals+pdf+downloadPDF 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_off00012d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14535 16972 bytes
SHA-256: 17a8483c08897529c9b6651b700457c3d36753da9fd0865fade9152c56bf670c
font_02_sfnt_off0001711c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1711C 10964 bytes
SHA-256: 241fa5ecc9f4fd6f0a5b067c2caa500f764a929b949e70194db7c83f60c02bb3