Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1499b4a6ac64e9c…

MALICIOUS

PDF

85.3 KB Created: 2021-07-17 21:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f107f99b2ba183419e740bafbb36e4dc SHA-1: c55a4c90df5558f5f25670f974fc2edfa61515f6 SHA-256: e1499b4a6ac64e9c6d3bd861db95655981067cf6af38c32c672dd2d13c3432eb
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. This suggests a multi-stage attack designed to obscure the ultimate malicious destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://jts-electrical.co.uk/ckfinder/userfiles/files/vuzuturow.pdf In PDF document text
    • https://mmszke.hu/files/file/82365377416.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/betanamagikaliboto.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/85085821416.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9qt8tbmst66a8fv6r7not42o7m/bufiv.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/rabufatufaj.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/wipevivafamef.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/7bc7f25343d5ceb75ac004409cb47a5c/72779116294.pdfIn PDF document text
    • http://gapp.fr/medias/files/juvulokirid.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ff86f021ebb33cf02fd08da897495597/17466060100.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/76800095244.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/d09b5ad058c1e89e8c7255fe29c4dc4f/42663340959.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/tuxugelal.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ipi5ifdaji984rpnn3c1378g9a/tuxuropibaboxedo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba1cc4bf4---28242251842.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/vivepijiratujefogugofud.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/m5go73r76ir2ec1qbik6c688gr/43148702021.pdfIn PDF document text
    • http://tms-operation.com/upload/files/risedenogema.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jasajanop.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/7414a40c833f6704322ee5e0ccf5a936/68900886802.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1lji7dona90li47dm3t94d24k2/25505608775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cotton+growing+countriesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 17328 bytes
SHA-256: 0e026723494e5395aae849b4c3d24b2f327b017934a396bdae77426afd737334
font_02_sfnt_off00013043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13043 10416 bytes
SHA-256: c2d6a015787156d678dd6bfcbcf5b07fd856aa56780dc5bc7f177012b4ec398d

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