Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1102a121d8e46f…

MALICIOUS

PDF

87.7 KB Created: 2021-08-10 02:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 344f1af68d462e9f8dcde3d1c90f00a7 SHA-1: c22922e4602bb541bd6f4d4602878a636454c8b4 SHA-256: bd1102a121d8e46fb44051c40c39ec7e32a444fd22c6e95b1c5441df48cfb6b6
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier flagged it as malicious. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ha73cs6slr4tsqmodop7go08t4/gikojuwulori.pdf In PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/lolezero.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/dafekewomi.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/47028001410.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086415b545ca---kopul.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/q4kbgcvrphn0q6qarohceo7kci/tufaravogufopilowufa.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/79930391588.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021071809153773.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/41e83fc79563b379ac8e28dbe2aca1bc/39001100484.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a905eb8cb30---kolawugir.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0dd978b5---bukiponojajuzexeni.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hmcemccdpgp091lgg55vs2l190/ropovegarexikiz.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/watenafebazepezagobofawi.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3ecdd822e500a54d1fd98ab2c845ccfd/76379730240.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa708cdfd3---femafilofebikijalig.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/xukalexofapolalibudenovak.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d80f5d804---60391645572.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/70166470205.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/zorefitoneg.pdfIn PDF document text
    • http://digifast.cz/userfiles/92578242996.pdfIn PDF document text
    • https://atl-50.com/files/file/24300853079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=musculos+agonistas+antagonistas+sinergistas+e+fixadoresPDF 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_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 18364 bytes
SHA-256: 48797a497db71697106d36e8ca17c26cfd90384b375f5426aa59e4f1aac43da2
font_01_sfnt_off00011cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBA 10848 bytes
SHA-256: ba026dddd519f27169f37116811202b141e00d006248441aa0e8ec9dce6f11a9
font_02_sfnt_off000135c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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