Malicious PDF — malware analysis report

Static analysis result for SHA-256 945ca86e62fc52d1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 15:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f5651aafbf0efeea23a0ac6c6ad2202 SHA-1: 1085de26f5e611500723ba041555841f84ce663a SHA-256: 945ca86e62fc52d17f5c21c395e72495071b1a8ed93799b73f972cf50a1e1202
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and a link farm structure strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sxnqx.org/upload/file/Fl202108161956183377.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b746c3f084---nisosukete.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/591781e16e8a5984071e719294c37507/kulafodalunaku.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/93649898417.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/moratosexinotupexema.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/98261060511.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/547ee163b2206a861b80b087a76c456b/75235920945.pdfIn PDF document text
    • https://morabia.fi/images/file/3381747194.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/fabazekezejexugirebomaleg.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/40496526038.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611320a18ba70---50200005402.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/70953954533.pdfIn PDF document text
    • http://congtyvima.com/images/Download/wufozobujizojujebotifazef.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854b8609f01---21346522564.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/68266899115.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7bbeb72e32230e7d892d8fbee65d221b/gubanu.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/33466517886.pdfIn PDF document text
    • https://path.mn/userfiles/files/48026414446.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/26b722d6800da1ec882639a94be10fc3/loraxoravagupifemodekire.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/nhk2l8r6n4b9085ki584v5l9ps/tazabusuxowa.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/bujiwimuwizil.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/xowezurigikomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=electron+arrangement+in+atoms+worksheetPDF 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_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 10840 bytes
SHA-256: a6ec0a8f3d0c6001c589e0da945a8cfad1b0f3ec032063f9a3751f588b612895
font_02_sfnt_off00011279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 17912 bytes
SHA-256: fe8b9cce319b1973fe93e8aae8e5baf7b6ef43857d838c7c98c8faf4127a775e

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