Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0527fc16d67eb77…

MALICIOUS

PDF

88.7 KB Created: 2021-08-02 10:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c844460cf1ebf4025a73d3f5d741c07 SHA-1: dc5ea8b723438611767f5b613872ecea2cbad611 SHA-256: f0527fc16d67eb77087a4807408d70a7b2172a02031378961e2531d7a5d6ea03
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to trick users into downloading software. The presence of 'utm_term' in one URL indicates a potential phishing or SEO manipulation tactic. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://axiomestates.com/userfiles/file/17117028020.pdf In PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/fapovukekosom.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/kodanuzumajeti.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e285e9f6---tekowesuxozekoz.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc160171e---zebefumepepagifoni.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4aa0efb9c412850cd7de89381e5b459e/fanuvuzaw.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ae31c711487555d5cfef39c1a51c1b32/gusope.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/cosn5fnvkuhn8lppplgj4gjm42/55904448342.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tklvprjb2vmihffg3ccq4er6lk/18836472852.pdfIn PDF document text
    • http://ozari-ua.com/files/file/20751785703.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/33511412314.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/48354008265.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/loredulebevetenupi.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/49495386348.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/nuxodakewiwewuj.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c56bad97ff9---446887233.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/pejewawagokikop.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/67189588208.pdfIn PDF document text
    • https://miet.hu/kepek/10786004475.pdfIn PDF document text
    • https://j26clean.com/upload/files/kefikixe.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/irhb0t7pu592g9dl6g3n6qjv5m/71581825580.pdfIn PDF document text
    • https://dafelia.com/files/96494375849.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abf2ab9a74---nimogivabirafefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nitro+pro+8+64+bit+free+download+with+crackPDF 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_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 11300 bytes
SHA-256: 2d0eeeba2335f97f24f3a23bdbf9e8a350f6bb63b1d44968076e42302b9a53a2
font_01_sfnt_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 17820 bytes
SHA-256: 5e5f15142cd44c5d7e35753300ccc1cb336567d8ac03a43f3854c8ec96bcc22c
font_02_sfnt_off00013980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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