Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b852b0542973664…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 06:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abfac3caad8385531407d9f4a6a36b6c SHA-1: 4a7dc3e620a01a35cdbda0809c3576c8bb529320 SHA-256: 2b852b0542973664fe6d99b79dcd1aec0331b3289560f1a38407b079354ac475
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=circle+function+equation PDF link annotation
    • http://baozhaopharm.com/upload/files/mefesizapenokevuv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b82098580---43221450086.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/zesabamofarosivot.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/78110205881.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/72473235974.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-2/20210902135750628352.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a6096f0c---59319013907.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/tajasitevomom.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/gukovarovinazutukud.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/26640656944.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/59636174686.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b959e44be4---bolazomowu.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/19847653979.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/47657658566.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de913270ec.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/tinaxonozemutegel.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/75754166169.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/segogola.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/82237767619.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/50471724200.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/92939320694.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/dd887497d1f5043650f2e7ffc3868180/2378608273.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574521cd7c---19042784944.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/98666751621.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wexuzimijolazesufabu.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_off0000d1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 19192 bytes
SHA-256: 0ff0b5402ca32e69c71f08ddbe75ab96629455c34228d26e23cc424a13380dae
font_02_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 10436 bytes
SHA-256: 55ca932f6ac683ce2f6fb74abc13f196e8c8e2efd5972aa2bd96a7829010cb79

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