Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39ed3ad7bccac3b…

MALICIOUS

PDF

84.7 KB Created: 2021-06-25 14:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9282dfec3779ff2b6baac9c31e6ef9b SHA-1: 750a563c5e73c4fd24e26020674f6208b2a26420 SHA-256: c39ed3ad7bccac3bf8dbfbdedf6c4b4d2fc7374a08c38502590033697d4b4788
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to lure users into downloading further malware or submitting sensitive information. The presence of multiple external URIs and links to compromised CMS uploads indicates a distribution mechanism for malicious content.

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://medvor.ru/uplcv?utm_term=projection+of+a+vector+onto+xy+plane PDF link annotation
    • http://abc-tel.ru/data/File/mekijexexomepisi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2418a313d13d81dad91f83313d32fa77/73734741836.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/99fb459096afd075e274a4a31be4baee/vofel.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a5fc1b58573c2875355bc51fba73ecf4/56359427798.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/jejodadodenitewawodexiru.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5002e7715---befinedetimibi.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/xarixuvibelugufujifigov.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/kibikixemevunuk.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/57022716142.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/f032625tfcsk9rqifstci4q9r5/83171362113.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c648db2b0e2---77031509832.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743703f413f---pogifuzegujotimoxan.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/bupetozejazesa.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/61376276583.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0720e2bb2cc3bff24e87dbc00a76551d/pogezudis.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/mexevefopibavajokik.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071f420379e8---sojapigazulitenevaz.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/gitiziritililanogokune.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_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 10720 bytes
SHA-256: 0b1b55410f55942acaf962831c6147bc732cd1d636e65b1f34d01cca8b36aeee
font_01_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001191f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191F 17148 bytes
SHA-256: 8d6ce0ead21893418eb9aeb3d153500902dbbbd6057d4e5bf1785b995905289a