Malicious PDF — malware analysis report

Static analysis result for SHA-256 85370152cb4bfa2e…

MALICIOUS

PDF

87.3 KB Created: 2021-08-15 16:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 95db3182269b5fca19e994a4c9847401 SHA-1: 6efb2660a7f1a2a3b23ff49e81ddcc54afac6fcc SHA-256: 85370152cb4bfa2ec567f809ebacea3c6f07da1a32f08d6a964299d3ea83ce89
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 compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc454faecfeba31925db34c99e5541d0/tivuvevaloxoxikobesol.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4153698e4---mulesiwinokizobumos.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/64410283334.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/71561723909.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/kawezikekuvaxoz.pdfIn PDF document text
    • https://esvigo.com/upload/files/73435603164.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/42251675343.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0aa1323d64---jopixu.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/liturepatavukosu.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c068463d506---26512666126.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/wuranogefekelasivu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/iv9qvogv0lvmpdo62pluem96a5/20681764339.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/42556972847.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vboffphpash9qa8u2rktid5q6i/56946398621.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/40174507438.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/xelasakerepokiwab.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/nilugonamosefexipukimuw.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/defagoropetalunowen.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/soguzopafelovu.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/minatuberadujut.pdfIn PDF document text
    • http://iltorg.ru/upload/file/towoda.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/purezizuroxagizom.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/wowadenowozuma.pdfIn PDF document text
    • https://lesura.net/userfiles/file/negide.pdfIn PDF document text
    • http://seamacros.com/upload/file/furiwexomemitumokom.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/3334818741.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/047833120b6c9ce9dcb5c4a76900fa2d/jojej.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021071902260070554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+connect+ps3+controller+to+android+tvPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 10824 bytes
SHA-256: 1e39e2a36365c53cfa0090b8d706841624eb9205f8251b0cf8ab70f7efd5890b
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 19124 bytes
SHA-256: 07c76cde4a96f1b8033c3a819c03ec72ffecf5d12fb09127b72633328be55b78
font_02_sfnt_off00013534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1