Malicious PDF — malware analysis report

Static analysis result for SHA-256 a246835c9bea6d1b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 03:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c47432a4e9b2301a5f3b07a2759f9e3c SHA-1: b88ea6e03f5bc3ca8ca85aaeee757398ad0c7a5e SHA-256: a246835c9bea6d1bcf0c2a5452b400c4a1eb3bb70553580227878a1b97e4bed5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised WordPress installations. The embedded URLs suggest an attempt to lure users to external malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://wastran.ru/uplcv?utm_term=refactoring+improving+the+design+of+existing+code+pdf PDF link annotation
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/i5l78jdvd3oe97tqvj69tk07m3/doruxowitokijom.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/vekenavakuzujebakukewijag.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b1c672f8---44259941383.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631866569_5c95f1c4e0.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/65525746033.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/tubuzolisugafavon.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/gevikakiwosiv.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/70203755086.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109162228206422.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/21457954144.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/zenajobu.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210912022005.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210906020633.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/ziripemawesu.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/digetofelevidopeledowur.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613affd98e738---kitik.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091805071173499.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jepiwaretexedosawipuded.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/37262366225.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/94200207275.pdfIn PDF document text
    • http://cloverdiamond.com/file/96690413718.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/1045715219.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/bafigoxojabezirofux.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC145 11236 bytes
SHA-256: a397b9f40d883d6448f51136f43fc12802766b69e61203c573c7e1ffc0a4b527
font_01_sfnt_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 16732 bytes
SHA-256: 7374b80f1e7279fb955a1a02bc21b7413324c1dc2b2814c0ba52e1c7c7aca506
font_02_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 17728 bytes
SHA-256: c65c4126f1b0b18680124909f5215da5141f00eadfcc6bcdf3a52b573843a88a

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