Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7be685160f92eac…

MALICIOUS

PDF

80.9 KB Created: 2021-08-21 07:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06e951560e4668609926a68d51be0d33 SHA-1: 6d4106d489ce7669277a932cc781bc1161fbfb02 SHA-256: c7be685160f92eac73816f8d74340f9e429da0e0693d5d3e801f9bc64f3d7a78
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. It functions as a link farm, directing users to multiple external URLs, several of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to potentially malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f319a0dd5cc---10634708139.pdf In PDF document text
    • https://9ja-bet.com/userfiles/file/19690960000.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8f50c78ae875668476e96c83fe8fba5d/jaravevivusuzetoki.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/37900d4a2b2139a038d7227027de093a/81478611711.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/mufewiditufoxovubikatexef.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///21001799466.pdfIn PDF document text
    • https://unosms.us/userfiles/file/98935793766.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/wekevusi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87ed1f82e---88662690679.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e4613824---4653118051.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/37643920565.pdfIn PDF document text
    • http://getvisa.ru/images/File/wikaf.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/90546772350.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f10b2650a59---54303032685.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/49241831536.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4dff2448---weneseruzukokalavo.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///gexudiwekarejulatofen.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/devudewawokatikebobekejul.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210704_1D2121E5039880A6.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ea9c4ff1---89360273468.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/20188162778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=movimiento+uniformemente+acelerado+ejercicios+resueltos+yahooPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 17096 bytes
SHA-256: 526336ebc16e7c46bf6879dc83f83ea3c51a38b7ff98b4c2b132c12ea0f1f93f
font_03_sfnt_off00011870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 11144 bytes
SHA-256: 195b5a48050775dee99c201ae19b49b8d473a1b27a816e868440ff1da41c9877

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