Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37dbe5ca28861ff…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 07:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 267d124fc3e593c4fbdaf12cb45e5026 SHA-1: b8654ac2481f2ec176f3257e4a8f5b4ab0e1f050 SHA-256: b37dbe5ca28861ff16d20f043f1a2a0112a034c53ce546cb130ed685a031051c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of URLs, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm to direct users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=merge+multiple+worksheet+in+excel PDF link annotation
    • http://aihyang.com/userfiles/file/56600773244.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/29879928056.pdfIn PDF document text
    • https://5udua.com/contents//files/29159896569.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b1647b319---62847821529.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/20969211394.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d88bde2b2---lisixuwekuwa.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9qvddc8t5p2ipn40j2djt8jqh1/41442754546.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/lubatosen.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e372de57b61cf761645b19f40e128091/36232790862.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/31od96j4kv9op1n8n1bkdpbp3o/94073765124.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/wedivemunisamiluv.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/83877367953.pdfIn PDF document text
    • http://jar-ted.pl/file/dabepanip.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i79ra7teg3mdpp0b4lip9a2dvc/zisudijifokivitu.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/xubizaminojajuta.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/xawofipojib.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16082941833ce0---67549262430.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/womadalura.pdfIn PDF document text
    • http://davcpundri.com/css/file/30012063897.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aa22c9f88---nikigorijixunisinalej.pdfIn PDF document text
    • https://bamor.org/userfiles/file/34303616990.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/viwifuvoruzerub.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_off0000b8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A0 16128 bytes
SHA-256: f9e739d52c7640567a70afa528ce2f533d4b9ce922a6c99bd9dfac2926c54d0e
font_01_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 11032 bytes
SHA-256: 895b8f8f2e7edb0498eac51f9679531c05c9c5663b4d7279ba9fd684bfe8d38d

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