Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4128e1cdfcc56b…

MALICIOUS

PDF

74.4 KB Created: 2021-09-22 23:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 055cbf449a25519e106c226439dd98a9 SHA-1: bda77432abc612ec0c2d044a14dea09c2efc45fd SHA-256: dc4128e1cdfcc56b32c1c2be797af91463f577006a50fa56efaa13aa9f079a60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.pes.edu.mn/ckfinder/userfiles/files/81408597511.pdf
    • http://vuason.vn/upload/files/92692058258.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/goelour4h83pkoc2s4a2s257f7/97761645855.pdf
    • http://codienlanhminhquang.com/upload/files/19759316273.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135439241114---pukunokumotodakuwanu.pdf
    • http://husplaza.hu/editor_up/33911753146.pdf
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/zodasosamadoporin.pdf
    • http://rewitex.pl/userfiles/file/97787101215.pdf
    • http://likebarcode.com/image/files/20210905_053410.pdf
    • http://gpkoaee.ru/ckfinder/userfiles/files/fiwepa.pdf
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/64950771946.pdf
    • http://minhledtran.com/luutru/files/mugagejob.pdf
    • http://tinhdauvietnam.vn/upload/files/40699459392.pdf
    • http://capital96.com/userfiles/file/nulatefofapute.pdf
    • http://madinagirls.com/easydo%20v2.00/files/uploads/12560365165.pdf
    • http://primethailand.com/ckfinder/userfiles/files/lasezifofum.pdf
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/xonixumaj.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jr3t999be2t67s3l8lv60emaoa/xojiguwatavesokawadonedi.pdf
    • http://klwas.org/userfiles/images/file/tijiwemozejaxurajumama.pdf
    • https://pasarantogel.com/contents/files/71910356475.pdf
    • http://skyrybupaslaugos.lt/uploads/files/fapawovomaju.pdf
    • https://mklaassen.nl/images/file/85930967047.pdf
    • http://yuqiaohome.com/uploads/files/202109181714321110.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=need+for+speed+most+wanted+for+android+offline
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF15 16792 bytes
font_01_sfnt_off0000d727.bin
0db6d875e8ef09de5ea1b122857774423b57fea3b5220a01b3636e3c0413fa4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 16964 bytes
font_02_sfnt_off00010315.bin
90a9b7bd8c63cf7ff5156a29b05210a6a021f20240668fdffd17d276696c385a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 10720 bytes

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