Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5e6894100499e6…

MALICIOUS

PDF

72.3 KB Created: 2021-06-25 13:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c19dcd96cf5270bb64d673a977ee312a SHA-1: c041f10295cde28a31babb869326b549703d22f4 SHA-256: 6b5e6894100499e6ff13a88f1addd9082beb667c7c2c0c5e2518613c1b255fc1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pixomot.ru/uplcv?utm_term=national+daughter+day PDF link annotation
    • http://soupworld.de/upload/file/34198173981.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sulisubaxeralodo.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/45151254845.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7348c116---sofapijegibapevataj.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/lipudefijemam.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/vg1gj93ab0qv7ooqejurufkkr5/diliwifovobuze.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b95052d5828---kanebubef.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/dozixogezosi.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/18188639619.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8081471a9f752a426c1e99f0def10068/46113874826.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/batul.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ae1069cb7992c394b1226e6ae43786b8/rexatopek.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/492d928d692be0eb04e4433adba000f3/3103607268.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_off0000bb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 16112 bytes
SHA-256: 9011969f03c78faff42cc6fd7d0270372c2c2293609289966859b5773bef20d6
font_02_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 10552 bytes
SHA-256: ffc55cb89e23abd9b02c82bbb3af69e58e427f2baf58f60f1a28178b9d55bd64

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