Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b0af81c7a23bbc…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 19:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8477ecd57d95e90a79ed312c62ebd67a SHA-1: 9f1a56fb7b50fb158bd19e311179d923d13a6021 SHA-256: a8b0af81c7a23bbcecf0316ff44cdb753004e947b6f7b7e28f560ce9b64c4ee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of external URI heuristics and the link farm detection strongly suggest the intent is to redirect users to malicious content. No scripts were extracted, but the overall structure points to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=iphone+11+pro+max+launcher+download PDF link annotation
    • http://retailcop.ca/files/vedifiwu.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/60212368416.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/matexajem.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/juzisodigibiwozo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdd1f97d7c---sunexoxutabedosi.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/reguv.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/gimugelojezowezam.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/482682b5a8f88988c3d884c591e136f9/17951507053.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/27823339209.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/gasava.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/mitavovepeluwapek.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/99463163425.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/80385793060.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b6b7eb0495de431bd731e60ecbb9492f/6854696087.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/zovezizovoveniwumuli.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/sefibegatimogavu.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/12420055007.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/tutadijaninisunenija.pdfIn PDF document text
    • http://zaiger.ru/img/file/gemudab.pdfIn PDF document text
    • http://fitviewer.info/files/file/rikizozu.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/punetuli.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/84512711748.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/78565242442.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/97716426656.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/98236515752377dd1c60c7dde7dbbb30/zanitifovadur.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_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 10712 bytes
SHA-256: 49586c43f9d5b2bf10785f0a2c1c52ace27b0f884dc72577cbe6b16ff29b49b7
font_02_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 18312 bytes
SHA-256: 006289a99b268c00ec3ef7265336dfa28b670db15bdc0abc06d4c34fb5f9e739

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