Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ba121116819b4b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 13:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ad626c6e654aaa57948921b7d00a50f SHA-1: 34f95065e3bbddde48502c9bb61720858b64599b SHA-256: 29ba121116819b4bfd68965daf65cd08ac5d38d7c2e2df666c73efccf0ad7bb6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of links pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable, suggesting a link farm or distribution network for malicious content. No scripts were extracted, but the nature of the links indicates a potential for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/310b629ec22fabf1c40bcbf126881d86/91382368697.pdf In PDF document text
    • http://se-ty.ru/uploads/userfiles/file/malemivodejeludi.pdfIn PDF document text
    • http://iccarrentals.com/files/file/jeleziripoto.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/gelitazagufusakebirufij.pdfIn PDF document text
    • http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/mefageganifujawakade.pdfIn PDF document text
    • http://cnispgroup.com/filespath/files/20210817003257.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1731c14973faa0780518a837fbccea9b/tugutajamezel.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/tovizupisunoro.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160afd437c31e2---kupaborumipavox.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607182eccb32b---23146467950.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/turem.pdfIn PDF document text
    • http://cga82.com/admin/File/favabagagonebikamiwumebuf.pdfIn PDF document text
    • https://ancoraeducacion.com/images/gawokuxefaxefotizubo.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/93975706709.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/43ce9555b0dcfd1618592f94bd76b416/83752656379.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/07630e981c10cb370e6d40379f70d197/49508863367.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6mju4cvsb3vnc6r8qehkd9172k/52918273003.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608539f1f1a88---4275471262.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/pofobukibodino.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4af328a071---14237818464.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/subatuluxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=usury+in+islam+pdfPDF 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_off0000da9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 18344 bytes
SHA-256: e3de139db49c3c81bd8756365b100de15d2bf7edacbbf5ee5a2b1a817b968b2a
font_01_sfnt_off000109a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 10528 bytes
SHA-256: a64a67e031484893a8a5336188aa170ac6e91592380d5157825eb1f41e858e50
font_02_sfnt_off00012188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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