Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39f321e7a76e282…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 00:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 221591486a36d8a76c4a3184218db61d SHA-1: 5667a4a2f278e8407c21ce3381e75d3104189dc3 SHA-256: d39f321e7a76e28217bd9faf5162ecc583720a7d5ad0b6f027f3055a5b9b3949
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=fast+and+furious+9+bolly4u PDF link annotation
    • http://ned.ru/uploads/files/24074436547.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/91364966491.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/48017011210.pdfIn PDF document text
    • http://brenderup.ro/mm/file/55519077801.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/086abc7dbd2c979d4d9c5044d3caa67d/paxewarowab.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/62378672443.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/17860779785.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/jefalonawexizuxavev.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/61956827202.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/tetafezuwuwarumugak.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/23940580907.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/fukulujo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131540c03395---wozafabalosudod.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dce71beb62---raresatexedovodiwaj.pdfIn PDF document text
    • http://innotack.com/userfiles/files/nowovutimal.pdfIn PDF document text
    • https://norservis.com/files/files/ruloxexubemir.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/98362417493.pdfIn PDF document text
    • http://dsfly.com/uploads/files/76313422219.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/vibowubazirajisefi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145ad869672d---lupilefuriwiposas.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614113c263047---sogimixedowubawaba.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/dazegoj.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/91907531897.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/51880851281.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/nilojokutetagarov.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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 10792 bytes
SHA-256: 15246d02fe0f21ce9f84d776cdd61062c819fc05fa6a0f27e37be2f50443a283
font_02_sfnt_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 16612 bytes
SHA-256: d397f3df3a847d70f774fb7d539ab06b83a00bc2623789067b05b3551a8a47cd

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