Malicious PDF — malware analysis report

Static analysis result for SHA-256 de87d65e985153b5…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 13:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6830ad3bc41c4adfbdf72c14afa404c8 SHA-1: b10755652a9fb82490fdfc2640d9c33de525cfb5 SHA-256: de87d65e985153b5fae683086dea4b3e0af580a355c647ed71602e177d9dd116
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification yielded a high probability of maliciousness. The heuristics suggest this PDF is part of a larger phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=lectin+levels+in+foods+chart+pdf PDF link annotation
    • http://tylincms.com/userfiles/files/buwadu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/rbd1o8056ano6qjdn91mbuq7jr/mumuxaw.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/45084754393.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/dd4b941c63a47dd7c11268bca09bedbf/silozavagodomuzopudevir.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/komagezasuvar.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/45948446793.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/juzotaguwometemojaz.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/vamot.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ed5845989962e30cb52b411be8b2b61e/40772009136.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/82884782377.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/456ce3db9e6f10c9ab7fa8b1eda9e246/muvepaxawatiwuwikatele.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/5131006147.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/59783894046.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/beromaxew.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/092ed6e3678630f36325959982d5e362/wunatibelo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/df9a854d87bb189ca9dadddc409fe4a2/40446521380.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/xokegi.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/17369180646.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/durakedipe.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722d87d2544---51160156385.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f92be67ab4a1636151e67ef3d420a274/jubitagirijiwimo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083287784d73---nusazenumaladevuku.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_off0000bb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB18 15724 bytes
SHA-256: a4424a1987e0dbec0cfcb016b1f7628891bb3dc5b1d033be81b3a7b939b25884
font_01_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 10740 bytes
SHA-256: 9f12d7f9e2306d3f033051c2490362bc8b60c58c0e9d7f0f760572842c2a1637

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