Malicious PDF — malware analysis report

Static analysis result for SHA-256 2790e73a6e9e8189…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 23:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5f89d2b387e2f6d93c493eb1cb3a42e SHA-1: c1c4b1c4b805170eae65096c974363471aa04bd6 SHA-256: 2790e73a6e9e81893c5525a49bfa6ffdd9bddc1515325d03d3df93f68cde6721
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and the link farm structure suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://birnagarcollege.in/userfiles/file/76885167301.pdf In PDF document text
    • http://worldcar.jp/userfiles/files/fajekowu.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/wowelupudosod.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6d3429fb55333a466432bcf3f63fa8b8/nefulegexeburudivasibab.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a91e58321a8acff8410b79ef82d02e23/80249356426.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/gudoluwutewefolifure.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/82248571136.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/31010961261.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/skn6dd4hm7mr3qifn4jgtmco77/88798256135.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1bc69a057b57651fd21f80f3ed19fc9a/durasevufozolaxeranolif.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/vizuvipi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b013b63a005---kisunimos.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071144946adf---migijokomimadijolorur.pdfIn PDF document text
    • http://st03.it/userfiles/files/53519922546.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/nizililijulo.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c9e84a5767c5e16d3dea0624eb253016/wizakujex.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/2832447131.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0kgrcp8kcvi74hqns7728059q6/gatiku.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/tukefamepoli.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/61142168920.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/70307001772.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160be824fe48e6---38756109205.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/35527248433.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/49948755847.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/ec49373acc5789f0cb6cf09f7b81c38b/64904417203.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2ff9d4cdaa68bd366683f727a8759d93/13576840983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=canon+pixma+mg4250+manual+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_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 17788 bytes
SHA-256: 8685b1099983fcfe80c12a46b7a6742c40501a5458781d03dd0766cb0f3827f0
font_01_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 11028 bytes
SHA-256: 333980523008c57dc438b35ce1a165197a0823179817c5ed771ec2a51767d41f
font_02_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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