Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd83b7942ca985b…

MALICIOUS

PDF

104.2 KB Created: 2021-08-24 07:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60e945bcd58b65adc8f490d6c95226fa SHA-1: eaa4c4273b683a8b4dac8ddf8d101a0adf6b44ef SHA-256: 8fd83b7942ca985bd08d480bccd4874fbef92cee888b778723c7ce40a226c455
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to potentially malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially engage in SEO manipulation for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608af07c89fb3---vodabilegapelel.pdf In PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021820219386365.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609241f16aa4a---33457432135.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071651a01e57---14648624288.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/finezezubobizovovapuvox.pdfIn PDF document text
    • https://yasacompany.com/upload/files/28725141849.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/45543345985.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/gafalupinanobowumugozexo.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/791643c14ec6c2bbb0bdc6256cca7d66/towejubevuzuw.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/53901436619.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gatafebazalibuvurigawopem.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aec675682f0---73105597594.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/19813312109.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/fevezagowasew.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/57156774369.pdfIn PDF document text
    • https://patc.fr/imagesfile/vusunoniku.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a99832d6---98445175196.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/jitanutojazopak.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae870eda82c---68981230597.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/fewalavazuzumin.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2aa4ddae9---52394774095.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/82617849269.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ede4dc76c903ee64f6a82091fd9077c3/18958859353.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9cc0341da2---13970052774.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210520141309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=god+gold+and+glory+definitionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 18316 bytes
SHA-256: b8c6b823d76ec36b4bd5664d50bde8639e8a595dadec3256e03596e091625267
font_01_sfnt_off00014a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16219 10512 bytes
SHA-256: c789f85a7d2631ea1127d38245d4945e0ada35427ce049949d634afe4642fa9e
font_03_sfnt_off000179f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179F6 16552 bytes
SHA-256: 6a76af66750c7f375ac10d9b96a81a2e283eacf38294d7e4fbc7cd432810a524

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