Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9db8cc27e7b155…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 04:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7da29a661b1b4a2d7f3ccd8e5a4dd176 SHA-1: 2d9a039c22277b02e81bbab377a73c8a0603294c SHA-256: cf9db8cc27e7b15596f7371c35d8c46c2c647f408d023b01279cb4a013fbe307
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous embedded URLs that point to external sites, many of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://irlanc.ru/uplcv?utm_term=free+download+mp3+apk PDF link annotation
    • https://hijaustabilo.com/contents/files/19238719274.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613588fbb8131---wozukuwosalejodaxatedubo.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/29169673562.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5d3c9cbf65c0577678659453008408c0/sepibivibivi.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210910_7F48A9D10FBFFDBD.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/36335468312.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece0353120---27607546267.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/6364485087.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c4311197---kaforegegurananelegi.pdfIn PDF document text
    • http://profstil.az/userfiles/file/xekibajoval.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/xamisexugepagise.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/22081115282.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/ripaxopatode.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/67799629517.pdfIn PDF document text
    • http://wohingltd.com/userfiles/ruveveboregeriwukusigoxaw.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/doweviluwidukod.pdfIn PDF document text
    • http://chongros.com/userData/board/file/20653049847.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/numokikugiwodudutoni.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/gefalimigiwiwiv.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/23e55f7f16a223c6885f536924fed884/zoguguminowogabexam.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/77386550036.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/doxivovetobosuzamifobu.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/38665491572.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210905_3445C845C5FA6203.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_off0000d4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 17852 bytes
SHA-256: a86b2c3b0f7ea1687e8901df92ab6add760bd743c3be054f7195748c71e14ba4
font_01_sfnt_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACF 10520 bytes
SHA-256: 36197207dbf81066bfbdd8b1eca77e37ce16bfbc14a44ca70fd68a0fa5212d33

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