Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd445d8ffa35d5aa…

MALICIOUS

PDF

74.9 KB Created: 2021-05-29 20:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e365c993c6ac022e53ead567aa42e527 SHA-1: 3682a003103acce163c69b8b88eebd860c80c704 SHA-256: dd445d8ffa35d5aa8e15a92376051f79ea25d0ee3b63e3d59301b98200d47e66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to create a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=what+does+affray+mean+in+uk+law PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792900a829a---vavemigozomejepa.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/hi6dti9ss27n62aooppakgtq97/42995847741.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/zumokevanowokap.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/16657809113.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/50dd7308adcd581b69ab74511b54f0e0/roxedidotobonuli.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/82bcec738ccc3feb4418eeecc53dbb8a/tagiluxugirepotunukaze.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/dc4bb3927b720af6417c2ef142164cec/wegobarobalidonipiwum.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/eieriq9nj65i69krv57pfh105j/52056879009.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tgfqn88kpsqksbpp56qkq5p1c5/27038134160.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-29/20210529182749532931.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/2egjmrj4h9cbngml2rtqvlfd0i/39129692552.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/bopirefizonosir.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/givixonovuxegod.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/j40qdjklbstimkeu4pd41vopgl/limixikuvedowe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 5300 bytes
SHA-256: b7e174c5ade2c192edf9d851c22c7f3c190b5e41211d25b6712f18a3c17d28eb
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 11060 bytes
SHA-256: 2cb5cf87cef416831f00e8ea51698f7457e97886b53866b7c3a5339c50a7633e
font_02_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3