Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f9a14aff37df34…

MALICIOUS

PDF

76.2 KB Created: 2021-09-24 02:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 7f48651f672904d6cfbd8ef6f8b4ba64 SHA-1: 018b19235c6963c4c86d223a340e3e986507d31a SHA-256: 34f9a14aff37df343866b6a45cb41e847972f76d0c87d4ccde71abf0ccefca13
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable domains, likely intended to redirect users to malicious sites. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bistakalikotenetwork.com/userfiles/file/76244510685.pdf In PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/64811845366.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/3518550766.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc670069a---sididu.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/56038153904.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/kokobojiwijojev.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/xuligexumi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130eaa80b677---sedezupesa.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/wowobunojo.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/pipawovegosud.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/zofamamovori.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/55822919493.pdfIn PDF document text
    • https://senegal4d.com/contents/files/gevivu.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/99894788147.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161341aec35122---nirerodimav.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145b214bc5a0---nizifuzixodiwunowenub.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a078963ae---56613927651.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614277882fbf3---92291368008.pdfIn PDF document text
    • https://gadapavimenti.com/GadaFiles/file/wonotoxe.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/zugibewisut.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/padebejozomobuwukezaje.pdfIn PDF document text
    • http://prograsifkalip.com/files/92688309513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+deeper+secret+pdfPDF link annotation
    • 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_off0000c373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC373 18908 bytes
SHA-256: def5f886eb723c82b6cc298b89c7268b6833c4411e11b6ae58131afcc6e252bd
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 10156 bytes
SHA-256: afaf4a62b3c7b6f5df5c9d1d6b308d19a6a2d8817907b89b551113fbf1d12b34

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