Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a74f38d24d13235…

MALICIOUS

PDF

95.3 KB Created: 2021-09-10 07:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: badb5bce7267a004b3059b7d7799cffa SHA-1: b76a62ea4d1ca2b56b86afb8fc9835465b6dfaa8 SHA-256: 5a74f38d24d132359c3d2caf266563eec5bc59ace404cb2030f43cde65e1518a
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for link distribution. The embedded URLs and the overall structure suggest an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://psystat.net/candyticket/uploads/page_images/files/47621477500.pdf In PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/84124974998.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/91742233701.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/78158928156.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/lorifamixu.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/nigonotelumirawewab.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/78095805654.pdfIn PDF document text
    • https://jin-ji.com/upload/files/fagago.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/595396f3940ff1077f9f74193acbb1c6/mupulerij.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ce98bd2b7863ca373d42a582e7809b0e/vedigomewukiwofez.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161382d707cd9f---gofodokuzigorabugu.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuwopufunu.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/93856971370.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jq84nve0mt8ohopb5qep6fbg6n/95008560776.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/jinosowojupu.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/nawutovil.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/lalewotaleteperakunuki.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/75788850867.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161330e82f07f9---fikavulexim.pdfIn PDF document text
    • http://freeorden.com/media/file/sejavevogaze.pdfIn PDF document text
    • http://kezheng.net/Upload/file/40251171052.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/50196077260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=game+of+thrones+season+2+episode+1+123moviesPDF 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_off00010b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 11168 bytes
SHA-256: 3b32113b3a3227b321a5e72353efcfccdb973a93562f2e68b6849e3eab9af43b
font_02_sfnt_off00013d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D83 19192 bytes
SHA-256: 1c9563a79fd64ce9566adcb7acea636a7f00a859471c561e2c65aaa0a55f97f1

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