Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e7f6df07eea0f1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-15 09:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b36814c7131a5837f0711565f113c0b SHA-1: 23fe3ba8c499e7ba5e3d41eebf29c7d2b29a7807 SHA-256: c6e7f6df07eea0f19946168fa697d2c7e5b6c47c8de0df6560ff5b3416b3fe3f
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites. Several heuristics indicate these links are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=using+echo+show PDF link annotation
    • http://sibaco.ru/ckfinder/userfiles/files/moburizivibezakixopoxif.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/12159316395.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/dotilunoj.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/32703827148.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ahq97flsv9htle7e0j9v17pedp/mozizasim.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/lafavazobavilu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613227a8d9477---30115778996.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210908161002.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/golebanozumavivinabuxov.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161416545d0cb0---93799318421.pdfIn PDF document text
    • http://teresachild.com/upload/files/dodowetimejexalawokizuji.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/lozozodanepa.pdfIn PDF document text
    • https://fong-cai.com/upload/files/mapumiwime.pdfIn PDF document text
    • https://panoramabyty.cz/content/76466994862.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/nerotaludanuzebejomaveso.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/73405806035.pdfIn PDF document text
    • https://dacola.com/upload/files/kesogibe.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/20419957096.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131930ace678---44245556994.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/57164825335.pdfIn PDF document text
    • http://rsentco.com/upload/file/pukedogesagirixepojoxazo.pdfIn PDF document text
    • http://potya.com/43226334839.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/ruwura.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/72105320695.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/68538316820.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_off0000b843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB843 16372 bytes
SHA-256: 17ef8ff2b645f2a2db4705fde56ace412e3a6114c743bec63e58ea1ff525bc6a
font_01_sfnt_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10196 bytes
SHA-256: a58023234914e3240b2de1a87d7df94b1f723b60173d363f5b807009117644af

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