Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8544130b2aec75…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 22:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6875fd839005606de64ab1eeb20604a0 SHA-1: e492e4849d03e275a5cb6f799a17c785f68dcf79 SHA-256: 5b8544130b2aec75ba36ff07ca306603de76f1d93e76d90b7c3d41e9b3e63b12
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting, likely intended to lure users to phishing pages or download further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://chcial.ru/uplcv?utm_term=air+force+one+movie+download PDF link annotation
    • https://khmernative-rice.com/userfiles/file/sinesotida.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/34625237525.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/wefugajugadobudigipex.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/ruluwefejoragadizoxomewu.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/roxeligibizonunakidopixik.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/36098266791.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144e460cb41e---47250796186.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/86048715417.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3a6e4f08---54170129868.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/defumaxatevexinijikav.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/13572701963.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/61969135558.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/477hgi8rv0s9h2gb7q5besc4u5/89934071873.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/32297949410.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/56805814881.pdfIn PDF document text
    • http://zl369.net/userfiles/file/fefexoxododajolumezobexin.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/fd21a4d2c533068c0eab39a002f8c080/rolebodofadoxow.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/58312360381.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed49855cfd---1879495687.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16136dabe2d259---3608595963.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/kapezesoj.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/20458582770.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_off0000ca1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 10504 bytes
SHA-256: b3d8f634a55583f10e8e2000486914cd2af9cbc4d5c58dec603e4391051ff25c
font_01_sfnt_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 18836 bytes
SHA-256: 52c8f3fd6b8b12cd0bff8ec45ccc3b9e003a4a0570bf9853ec1094f0dd78969c

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