Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dc0c8c0ffbbaff…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 17:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60eb85978bf385a806df8b1087f161ed SHA-1: 7e2d9c75286076c254285e44963dde37cb667c15 SHA-256: 66dc0c8c0ffbbaffbdced0c73dfbf5be03c305822fe916e4afed6fdb4c7f92fd
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of multiple links on compromised CMS uploads and disposable hosting further indicates a malicious intent to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=minecraft+java+edition+apk+android PDF link annotation
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2047dd1fef914692c7125149cf850478/52290225721.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/56588604419.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161437c2414c79---febedavupu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613357c092ed0---45299589119.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/dilamaj.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413931bda49---35698829698.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/31hd8vmjkaic1noe19ccdjdqbh/37186020907.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/27094412597.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/83844762257.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/98290621198.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/wumidutelorimel.pdfIn PDF document text
    • http://le383.com/uploads/files/limuwatedika.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8b3aa070---30696402957.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/ripebeloto.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/sanagerokonelofetisanan.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/3423079048.pdfIn PDF document text
    • http://hongdacable.com/d/files/16271834401.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/4832347988.pdfIn PDF document text
    • http://soc-in.com/data/media/files/68983338847.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/15112088365.pdfIn PDF document text
    • http://salwex.hu/file/bokoli.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/76849528425.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_off0000cdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 18416 bytes
SHA-256: a8cf97763bdb1b01638cbdd019d41ce4a66ca65b714af93dd5f06e6792586cbf
font_02_sfnt_off0001160e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160E 10680 bytes
SHA-256: ec9953aaaecb569b2fb52927a728c4baf44a64efbc8ca4c4ecf0f25920f12b4c

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