Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8d4d1af238e878…

MALICIOUS

PDF

86.9 KB Created: 2021-07-24 10:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a15b860ff12709656a0819ed996207e SHA-1: e4702258f95977a80f898342175bcfaa21155a54 SHA-256: 9b8d4d1af238e8786860bda025e8c1f5175b63f94f355d515c8497fd1837a400
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ajitcoatings.com/uploads/43037598356.pdf In PDF document text
    • http://fernandopelosini.it/userfiles/files/tosanosiwawedovetagunoru.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a55777a1c1---xowujusovuvizezor.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/21261603328.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609095e01d1b5---75393293613.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/jofev.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072be692bb4b---34078384527.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/a1bb84cb1d16cefa76e5e236f4bdd8a9/61769661063.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/12082338201.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79fb3183b---nivizaxa.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52aff5429d---90816301974.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2815723f3---welemawasijaxepo.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/mukutufesuwufodotebesa.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f7405ebf3b74a3bb5b3410f25e20d758/10890655517.pdfIn PDF document text
    • http://dgjst.com/upfile/file/48581235091.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aeb5ec181---puropibunewevuzup.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/lotudumuzolovemeref.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/galuluvibiniw.pdfIn PDF document text
    • http://zerosquareonline.com/file/fibofigikiwunu.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/kizefajuligalabujevuvaluf.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-8/20210708131430481231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=app+auto+like+facebook+for+androidPDF 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_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 16808 bytes
SHA-256: 3a210fa40db79dee4d538b2eda9c29901e9878942170e032480c860a12373f70
font_01_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 10760 bytes
SHA-256: fd62b157a68363018519105e392d4a22b07f5c69f3d5a05d326396c4ebf6612c
font_02_sfnt_off00013521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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