Malicious PDF — malware analysis report

Static analysis result for SHA-256 838de16424c96f33…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 10:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e1db848ad58bbef0bb7454e6e5dac4e6 SHA-1: be163467785410e1a9a39d7a5ad8e12308e0aae8 SHA-256: 838de16424c96f33408af77decd9663df4ebc96cf30bd25a8d6a3592bbee71ac
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://perles-del-beya.com/userfiles/file/35205684317.pdf In PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcef5f8a513---lisubo.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/84979856516.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/kajawesalotofuzububig.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/xuvenalosokume.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3b921fdda84fa140ee19c2001a4f5e80/jemojuzulosetemevazopeka.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/nssucvudvgcua3t4bj53tn2p7f/97312982014.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ebcd7ffb0---73789380446.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/lefinapenusewizira.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68eb7f07a5---kemirejetewedononajox.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607785b3b568e---vagukovuvotewibubewimudu.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/77149f238e943dfaabaee8114db48156/1466042730.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/jeseleb.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/36376710024.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/11552691143.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/pebawadonogululigajemadat.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/oo3mtlaj5u2f3icgrnrv7a3p00/39272175849.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6357ecaca2---23869672088.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/jexaguge.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad2884943---bolenosakebozuzader.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/063bbf357b6fbbf808d049c0b9c68157/51129075513.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/54910523a1b377b2ecc933c5087cdce3/fumafinarewixu.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/42234003030.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cb940f1b81d---33573798951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=13+archimedean+solidsPDF 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_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 10664 bytes
SHA-256: 687b9e24cbcd054505ff8c266179658253004116f20e0929d0bddbaef0e3595d
font_01_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 2484 bytes
SHA-256: aebf8592362d3031b874f6df658f7a989ab959390dc42627d8bf6fb5e651fd1c
font_02_sfnt_off00010fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 19780 bytes
SHA-256: 9fc1d0b6a10f815028681b4d89fed80da859a4aa5388a0ab408965d3620cf3a8
font_03_sfnt_off000141a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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