Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecef0c8905444ba2…

MALICIOUS

PDF

77.9 KB Created: 2021-10-03 05:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8aab747ad87e96f3061adca26e324abe SHA-1: 553bc4229b50162d2b72bf502b8165a33c9ced0f SHA-256: ecef0c8905444ba2175118ceb06a897ca9db6c1c5327db8e1d0354c07dce1c50
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with multiple URLs pointing to external resources, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of numerous links, including one on a compromised WordPress site, suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e17932001---benukikugopen.pdf In PDF document text
    • https://snqrsl.quebec/upload/editor/file/39825116509.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/nozevuketurukibeva.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/bokinisajitubigiji.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c74d492ba72ccdc29c09b0d5a1a51901/30771524338.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/66113952363.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/tiseradanedevojezurosudem.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16150cd522df52---73561822616.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/30138127409.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/konafekuxejefatirinugat.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/24946101529.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ad8fc6ce2440be200628d0b17ddd239a/pewifogaf.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/80463770744.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/36199266908.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/regutan.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9298270f50f63ea8919bc7abed51e667/jepomimelisogejerawe.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/24539991330.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/zibekoxazawuruno.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/48887389188.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/58750151552.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/70234821167.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/87025747653.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/55136776875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=manipulation+dark+psychology+to+manipulate+and+control+people+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/tinajamanareludinidijeda.pdfIn PDF document text
    • 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_off0000bf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF41 20372 bytes
SHA-256: b133b5abcf5d6e8b1fb979aa2f0005cad28e7fba6ed08787238433d4cc7bdfe0
font_01_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 11368 bytes
SHA-256: 6796a174421f59d3352faedd54e36cd6ed0f9df405dd9c638f13fea3d759fa97
font_02_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1