Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8fc1aa67d86b18…

MALICIOUS

PDF

108.9 KB Created: 2021-08-12 02:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0e2c54f6855016cca5693f51dc6f29d9 SHA-1: 4d272855f910df6e4a549242ee3c9929e1161f4b SHA-256: cb8fc1aa67d86b18d9d30327780f69842d988753dd13e01abb2169af809deaeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to phishing sites or download further malware. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

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 https://archism.ru/uplcv?utm_term=1.+an+accounting+device+used+to+analyze+transactions.+%28p.+33%29 PDF link annotation
    • http://nicenpos.com/userData/board/file/vigidesebivajakiwokajat.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/sonuwikeko.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/fazepitaxogexelobati.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a1c6276a1712bdc3fef574094f17458e/87928527142.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/babobokaluri.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/eqqdk7quock0276p8nkclmjev3/66856275299.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/8ef28624424bba7836290c23aa13adb3/biwavurul.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610bfdbd58666---wawogikifufararejut.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/87240905424.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/metowosasosana.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/lujogabolezuvovami.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/27839391711.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/3696658447.pdfIn PDF document text
    • https://dm288.com/slicice/file/suwagasenu.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210514090051.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1cd2145352---bulubakagiguzure.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd50c18d0d---zobiduxojuzurun.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be23184d5a7---mukifipebufavesefos.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/44945522829.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/bexurugijiban.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/bewikujaletofiguw.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/59182388800.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BC 19020 bytes
SHA-256: 0095b5dca126a91ad53e83bb00450729273a956dd53fc5dadf225883e563c0df
font_01_sfnt_off00017200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17200 11380 bytes
SHA-256: 575a8c0282db50ecd44c7955adb130fe8ec76cbe5e5f012ab8800440599720ac
font_02_sfnt_off00018d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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