Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e02e81a60a9ff17…

MALICIOUS

PDF

72.5 KB Created: 2021-09-16 09:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e85543b3b547e498d0886cc7e9ea854 SHA-1: a34acc99ab0c829a2f430083762c8d91dca0acf8 SHA-256: 8e02e81a60a9ff1752499adb150162478a7899e54d703cc37e2fa02c8c962b94
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=game+hacker+app+download+for+android PDF link annotation
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d20b9025c791e3dd3f244a844b9bb283/36869972103.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/43109604262.pdfIn PDF document text
    • https://autoskola-scp.com/files/9666301185.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/21248009702.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/mexef.pdfIn PDF document text
    • http://seamacros.com/upload/file/botamix.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417a3c26652---jaxerojivozosareporawupew.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tizujanidekevegobitudog.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jozopa.pdfIn PDF document text
    • https://ubranni.com/uploader/files/14824850253.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/jojasajebotelotax.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37225558487.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/70657062198.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2f86be88c---41989136568.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210916113406.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/gepat.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/43629244469.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/vemevibafowutikirilokawi.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/nuzojebozuveged.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/xutizagafupuj.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/vatilamutajaxe.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/18195092220.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/duwekapoxamusisozupozura.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_off0000b957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB957 10836 bytes
SHA-256: da34f7eda81a38cefa1e84b1d92171ce382981f78ebe448e6c9dfcf66fe9283c
font_01_sfnt_off0000d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 16472 bytes
SHA-256: 3cdb197c5d68ff4993dfa107f197753faa75450c44dcf1b7b05aa56fdb351f2b

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