Malicious PDF — malware analysis report

Static analysis result for SHA-256 67238583411f5f1b…

MALICIOUS

PDF

90.2 KB Created: 2021-07-08 08:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6609c0f433f97eeb4029ff695fc68a28 SHA-1: f91e19b892ca63655ba2ab29dfcfe8d9bb652aff SHA-256: 67238583411f5f1bd6ee094599c954c03127cf9c5db4ffade5d83551703b8d33
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on compromised CMS upload storage and disposable hosting indicates a deliberate effort to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://shipnhanh247.vn/asset/files/wuzuzududelizefiweg.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7dfaaf242---boren.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ff3a5038030552d24834a3a872c3e49c/94757468118.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/6533037260.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ddc2e281---58828092776.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf879ba4238---16087875080.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/52711265432.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/82857129474.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/97579460851.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e96570079---dubuxafuzutupetoremow.pdfIn PDF document text
    • https://mszukam.pl/dat//file/21530078118.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/26882806787.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/89334462855.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f386b97ec---vetinetajobe.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ff17b3c97fb76b2040e5d823e9298d02/24427223604.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a89e2f3a63---kiwumedijomuwudejofo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0be50429e---bixelakedog.pdfIn PDF document text
    • https://turbooto.vn/upload/files/mozajunafobuwo.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19f9961ad---mapefowobetitewofusuzeref.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/92604991024.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/67695834908.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/81774194199.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815f25c2217---99274360274.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50cab29676---7616377065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=is+rolled+oats+good+for+youPDF 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_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 10496 bytes
SHA-256: a08a3f837d85bfebed498926e729a0c4b1a037740569bd801f7ec1c6faaef19d
font_01_sfnt_off0001131d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 18060 bytes
SHA-256: 68cc619b2ce0b5c4ef2156c8bd4e80870c97add1107497574b1a9113811521ab
font_02_sfnt_off00014242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1