Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce1db32b4145ae9…

MALICIOUS

PDF

83.8 KB Created: 2021-10-07 16:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 75f28103962f8ea2caa85004666a47b6 SHA-1: 322f71670e1ce757eabf3846271c988ff5c27cdc SHA-256: 7ce1db32b4145ae9433023091c49e0038ef8d3f6036b8f0d0045a787851af890
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using disposable hosting and UTM parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pixomot.ru/uplcv?utm_term=the+wave+in+pursuit+of+the+rogues+freaks+and+giants PDF link annotation
    • https://dacola.com/upload/files/gizexidolameri.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b248799b1aec827466a03064661104f9/50280199502.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/wuged.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/47808999802.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/jemitajenukivetevazavur.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021917953452245.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/76979819097.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/39797589270.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/rojabiwapomoli.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/51109718248.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/biguvomuguramokezikugisok.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615cbc4ab68ab---88402625870.pdfIn PDF document text
    • https://hujanuang.com/contents/files/fusigigujefujom.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/witatililuwovovibu.pdfIn PDF document text
    • https://norservis.com/files/files/ziwulilajikuruzumifid.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc570ee5f---50791206268.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/repiwatanukago.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/pujuxidemilot.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156de40dc509---sazusevodufenituvulimun.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/mepoja.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/53341388279.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/66419767784.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210919160117.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/71955985357.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210914055403.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8ohpglh8v4fh022i08lvnerfri/78977284916.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/6705599302.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_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 11040 bytes
SHA-256: 0566da358d7a2b919d9fd1f03084d965f85eca5036a67bea2aa7cd84a2c8482a
font_01_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 19048 bytes
SHA-256: 383f6af7821d35957cdd78db72d22805293b9fa175164d602c45e8f3c2dba89e
font_02_sfnt_off000128fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1