Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5130f12b577eda9…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 09:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ddca630bbb5deb397ac77b2c84a2693 SHA-1: 4911ac3df19b859964a01813f7cbb58ff68d810f SHA-256: e5130f12b577eda94d6c15b6ff1f30baf37f301cbbc31afd2bdb70209c5abd4e
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://maristaslardero.es/userfiles/file/20489375006.pdf In PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b337af54631---6519173360.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/qe83keaouhcl59io34eahldbtk/geweremikalabapofifop.pdfIn PDF document text
    • http://snsi.jp/image/news_file/76054688867.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/26333198493.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/gagesidesitodexasos.pdfIn PDF document text
    • http://infunplastic.com/d/files/bewuwefud.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/tigodogalojebiloxakimeme.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/16245656923.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/zerug.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/xexenuja.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/soloxizojudozigasidomoboj.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/86021330723.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bed72bab77---bawadimivariximigijulaxu.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/zomuroselemexe.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/33934893949.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/tegisur.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/15258471080.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082533c6804b---xananugom.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/43300605485.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/tuwaxixevojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=social+issues+and+the+environment+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_off0000b870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB870 11212 bytes
SHA-256: f7278c9451de380043ee2d8b6edf43df9a3c6153931a6a166079858044da693e
font_01_sfnt_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 17940 bytes
SHA-256: 7095f2809bd9605656410197856fc6035a99d180ab06880f624d90332ba1ce20