Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f8effff24a653a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 11:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca82ce91ff306c7d88a44a502ce97381 SHA-1: 85214f69facb45e3a38594b756642534d3b47d5f SHA-256: f9f8effff24a653a13e26b86e68cc9213533190070edd50f948bc87ee9f0b8bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. Heuristics indicate the PDF is designed as a link farm on disposable hosting and points to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=dynamic+wallpaper+android PDF link annotation
    • http://acutecardio.ru/sadm_files/lugolav.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/pewojaritosozuzopesu.pdfIn PDF document text
    • http://cityfate.com/files/files/lakevomolufitixa.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/be31328fe261cf919e48fc0506f49497/fedupamovupegikozigib.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/58381754972.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/jasesi.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/dinovogujemebatid.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/wozuvozasu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140663e8243d---rirejuneritel.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/69416188126.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/naxivogevokusewijati.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/lagigumagenisus.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210911_851790EF8C268326.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/raxisuk.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/todanizaderagezinon.pdfIn PDF document text
    • https://landi-bg.com/images/file/lafalelo.pdfIn PDF document text
    • http://synphabase.ch/upload/file/rawivujekovufum.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/40755205164.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/buzal.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/poxuf.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tilomadufirevewa.pdfIn PDF document text
    • http://czyxchem.com/upload/files/67904138053.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a7e935e1---4281791867.pdfIn PDF document text
    • http://kyea.org/imageuploads/kavewo.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_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 10612 bytes
SHA-256: ae3af08b883b7b13a946d8f26a2f508bd09467d87452a50574ba409ab41c0d63
font_01_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 17684 bytes
SHA-256: d192c91e1dbc4d11d4af1b0e06229bb9a4aa908fd8dcdc5ce26657f288690f4e