Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e78f77941299590…

MALICIOUS

PDF

95.2 KB Created: 2021-09-18 08:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 598981b97538f2cb428a894ac1e36457 SHA-1: eda924b3c96c09597fc9b83954e17b11202c7a35 SHA-256: 2e78f77941299590614dd3e9d22018010a8e2dd4867eb78b7f124b576812e510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing pages. The presence of external URI links and the overall structure strongly indicate a phishing or scam attempt designed to trick users into downloading malware or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=7+habits+of+highly+effective+people+book+download PDF link annotation
    • http://retailcop.ca/files/31292933727.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/xefosugiruduvadenugebejaj.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/16838904132.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/nobigitaxiluvejubaxosi.pdfIn PDF document text
    • https://thehouseproduction.net/file/midirapebovidalezurataz.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/sefoxerilu.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/87883117964.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140887d69bb9---kisiti.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/sowuxuzinezuvirepe.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/44953937786.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/25366774971.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/larosipijuxonodupera.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/bugututu.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/59858922795.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/biwulimuzibojaboloma.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/52794437559.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380442921aa---lotimudezaludorivefuviwi.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/4382675940.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161397ef17e8fc---78363490143.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/64458939914.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/74945736633.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xixuvomudu.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/60325612562.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_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 18924 bytes
SHA-256: dc432e8008d21cc67e224da069465826cc4ee2dff5e79237d15acb4877cc2e5c
font_01_sfnt_off00013cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCE 11252 bytes
SHA-256: 6d0c1f3fc91be920fecbbfdf5a40f3b7768a6878103c1cf0045ef1a0f533295c
font_02_sfnt_off000156e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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