Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d192612a75f6fd6…

MALICIOUS

PDF

71.4 KB Created: 2021-08-29 10:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 157c82b51b731511ed0bc7cea28c06e7 SHA-1: 4f0da443012fc881fd29c14c2429b9780014ebb2 SHA-256: 8d192612a75f6fd6c363ec264a5aaf0360d14646258b9489582e2a13532de347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farms pointing to potentially compromised WordPress upload directories and disposable hosting. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings suggest the primary intent is to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=best+torrent+site+for+movies PDF link annotation
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882b37866c0---zagiwosidimegigeduzojugep.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210829_093341.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/wepemesefirebag.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/fedetumujelo.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/20d33b0864e88e53f86e335f0e3e2d57/13827392129.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505181032808674.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe980a71ef---28635444084.pdfIn PDF document text
    • http://tillyardci.com/userfiles/file/92601375789.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/56611642383.pdfIn PDF document text
    • http://vaithun.net/upload/files/51414045309.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ec41fcefb37---neruvadanojivavixevane.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/74420362373.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e23e37b4a---14425800461.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/vubazelonupitada.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/95300358436.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zimaditawi.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161156018e16a0---9932243328.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/rigepebinuru.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/dutewewegakagaj.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9e61395f41ef69a37880574d025d85d7/laganukelepatezibuguwewow.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/58tropva576o9sui9mm2q91qui/xedejuzelabi.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/fifasobinixinizi.pdfIn PDF document text
    • http://0930actress.com/files/files/67359858315.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_off0000b711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB711 10284 bytes
SHA-256: e6ef612b3fd2f01f15f22df6103c0055bde54a225d63bd2005cb4ca50f6e1e96
font_01_sfnt_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 16492 bytes
SHA-256: e3d31c47234576b7afb4db68c9bdc33551bcd664c123d74f4be06fe3e3a7c304
font_02_sfnt_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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