Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f07362b475b330d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-28 23:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fad3ee084cea7a89ccc6f2e4e2d4fe0e SHA-1: 2513adb5d2a827a57505db28b63502990c4d610d SHA-256: 1f07362b475b330dd27b04499336195cb9aba1deb4dc00a4274ea6024d17cd31
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including those pointing to WordPress upload directories, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=liberare+memoria+interna+android PDF link annotation
    • http://gkz-crimea.ru/userfiles/file/saxipigepasezenijafu.pdfIn PDF document text
    • http://rld-carbon.ru/file/nupufofolulodusix.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5212361d2---gulijizizamikamatitosevaj.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/15267572780.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/wudutipulisozerupase.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210919_98ACA0B89A72F3EE.pdfIn PDF document text
    • https://lecachet.fr/docs/files/6080782278.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/24834483742.pdfIn PDF document text
    • http://airzo.net/userData/board/file/riwox.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/66778285555.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/gisuxi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939c729432---fekimezisebolo.pdfIn PDF document text
    • https://petribax.com/userfiles/file/33291143296.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/070954119425.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/pepof.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/40327535433.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/xunipurodo.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/40974997242.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/82443128388.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161412bb9efe14---18518838440.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/51817196997.pdfIn PDF document text
    • http://ombs.ru/uploads/files/8463065749.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149416d628bb---gojigiguzakosawiwejo.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/37289763281.pdfIn PDF document text
    • http://deliver.cueicha.com/assets/upload/files/guladalagokesejuneladega.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_off0000c257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC257 18688 bytes
SHA-256: ad2462875251439b90dd1884ad3408fa4cb035200a348b9f1652cb1ef3eeb0cd
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 10292 bytes
SHA-256: ca3fc911fd373ee4806c349a6cbfceea1f79b6cfc6bdb9ef88e4ee3690ae5b3c
font_02_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1