Malicious PDF — malware analysis report

Static analysis result for SHA-256 451ff1987fed8b05…

MALICIOUS

PDF

70.4 KB Created: 2021-10-07 01:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 902a7a9a9fe4e8a5d5d206cf99cc1d1c SHA-1: f271a34b12fdd78a9a649037e9b9f75772236411 SHA-256: 451ff1987fed8b05c3b622ee6ce9f0902f0e94ae957cc619946d60edb9fca7fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/85901090d378576015aa687d6f87c7bb/26877556356.pdf In PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/00bb557f76d78b1eb57e405e8a6fe631/lurapiximujovegapamigo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a94d8bbd6---79657013689.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/33766919272.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/polumizetosutilesulur.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/70345254342.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376cbe6c69e---nupimusobigijefivobawir.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3702480a---45886246013.pdfIn PDF document text
    • https://renewone.de/files/dofaruzoworaripozi.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/47008825950.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/zegujiv.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145003d57f8e---53761065024.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/62624840875.pdfIn PDF document text
    • http://akademibt.com/resimler/files/98988691459.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1f74f525a5337fb152142ac132322669/59622813166.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/fezotew.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed20cc3422---17423565569.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/fibamodobarofa.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/kowotuvuvoriguteradi.pdfIn PDF document text
    • https://durimawar.com/contents/files/kifin.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/69002178901.pdfIn PDF document text
    • http://offerparts.com/upload/files/kavafe.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151ea79b53ef---sefesavotu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409e4abbd7d---jefuvi.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/bugubevuw.pdfIn PDF document text
    • https://beaszemin.com/files/40851346808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+u+find+electronsPDF 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_off0000b70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70F 14772 bytes
SHA-256: 35d9ef63d919c181bb94d288b99de112d72f6ad4fe33df9464a6a558fe9c3f49
font_01_sfnt_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 10484 bytes
SHA-256: bc766099d633ef5d243016e6a60123f40bcb9b030e66190812146b256e9799ff