Malicious PDF — malware analysis report

Static analysis result for SHA-256 507394158973dad0…

MALICIOUS

PDF

73.3 KB Created: 2021-09-22 15:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0086b3cfbb471107d375e210530c670 SHA-1: ed19350e65ade02a5c628d5f6e2f204f1079de58 SHA-256: 507394158973dad0776325f5c9428961b9682fd475efc0fe25b153b440a7178b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://garglob.ru/uplcv?utm_term=how+to+root+samsung+galaxy+s5 PDF link annotation
    • https://promtour-rural.ro/userfiles/file/14735298738.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f1a55adad---1154130798.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/kejegitejutimuxaxesegozu.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/defewojekobefesarogutitun.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/3819291430.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/83409137992.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/xipodil.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/14861351378.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/58467512013.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/supuvujimi.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/pibenisonijorudafowode.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/xulomutotadolidim.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9b0d25ee---sujemasobilawa.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/zuzasulofiguzijukedaviza.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/93447531352.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/91250742698.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/rowuliraredas.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/dowojekulu.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/notasasabigukuketigunito.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/jetubarupajup.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b08ec1844---kapapewadux.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/61980723442.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_off0000bca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 10752 bytes
SHA-256: 1820812edb94109581da48ea588e965677f0a1daa0566346d6bba81786fc0056
font_02_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 16328 bytes
SHA-256: 2d34139515e5d2e5101d39b0be6531daa52533fa8e293b41658f3e5b8477887c