Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd17a0c4b42f87c9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 14:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 581045ff20d777a2820ac470c2b88b56 SHA-1: f2eb4359d689656b88292b2cfdeb904cc7c4cbb4 SHA-256: cd17a0c4b42f87c9e8ae70b90566f9c536d3eea75db2ddea83a732bdd4ea4037
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 ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users to malicious content. The presence of multiple compromised CMS upload links further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://sky1981.com/asset/uploads/files/vekilogepigenuguxekulurad.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5bd0af14---zokire.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/jukukepevexodenizewad.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ad7f4dfaecfb93f698ca1f0e42ec2b8f/xebasovizuzakujefeke.pdfIn PDF document text
    • http://protezas.lt/i/File/zunasizefafasasetodo.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109121124222361.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a740b90a9062da2bf6ae743184e09c11/60923299535.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161424f2f9079d---rizatebipiz.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/niwega.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/pijiviwoka.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/13080615923.pdfIn PDF document text
    • http://dgjst.com/upfile/file/43310837137.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/nerura.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/78526509707.pdfIn PDF document text
    • https://panama4d.com/contents/files/49659241661.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/posabaparudalep.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/48506946164.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/77216068552.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/80864307793.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d5401931e3721ae26763cea0d007ee33/962835097.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/40633495267.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613942d42a14a---4219100580.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/rilogelixixibex.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/razuwenameliz.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/89104578405.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06a956be6---9038501027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=multi+bluetooth+audio+apkPDF 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_off0000ca90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 17596 bytes
SHA-256: 86bda9d47c01e731af278ef625fdd2cbe217418fd8b497aa5ee357a86cc6b347
font_02_sfnt_off000110d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 10440 bytes
SHA-256: 50d3c48742755cc9746f24af279a772de2e2904396ee50c49846ebd518d81382

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