Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e9cb7985350a26…

MALICIOUS

PDF

93.0 KB Created: 2021-09-16 14:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02e0f7e375f7364b73052c88d7a74769 SHA-1: 67122e4fa5ba22313db7e3317137f0793ccbbfba SHA-256: d8e9cb7985350a26f47060a6673a9f01d5e19985a1bab16a9da21657c767323c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b6ee03c2---75364697962.pdf In PDF document text
    • http://architettorobertafasola.eu/userfiles/files/91685433853.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/94617870927.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329a5d693fa---85329706278.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/f101lmm6mreijb3il2pss07n76/11210222412.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/6457f3lnu03a1arvi6fpa0bj61/xezelisuxixaxedo.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/76269956993.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/dixenelukafuvimuj.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/36331000002.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/78849250420.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/sikepuzukurarusadil.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/58299688305.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/87896372732.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/nakasinam.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/suneram.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/2185902761.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/pibumatulusubibusiwi.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/lipogog.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/pakozatuwawokadivopevuxuv.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/wirugopemixugususavot.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161375186e5d9d---66399783381.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/53730471345.pdfIn PDF document text
    • http://lg-palette.com/upload/files/61138291318.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e38dc52ca1db5bc2fb5afae105e106dd/kuwuzedipabiluvazusojal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+giver+full+audiobookPDF 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_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 19104 bytes
SHA-256: 3e5890bf72394c4e57a54b1e4a55a36a029abed0f43685d1c7b1200637a493e7
font_01_sfnt_off00013643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13643 10624 bytes
SHA-256: 6ae61afae8ef57fee3f98e94aee4dc9554a8b48a12e3f4b006865efd4d944df4
font_02_sfnt_off00014e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1