Malicious PDF — malware analysis report

Static analysis result for SHA-256 593bf41ead8d3af8…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 07:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80e55a4247e11f3df224c5dcefabfcde SHA-1: 52e3b6685dcfe835c4c4d5bf5558cfc099da480a SHA-256: 593bf41ead8d3af841019689456b0b8e809c15b4f0f7eb7f995e50e828724e75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs suggest an attempt to redirect users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=comment+r%C3%A9diger+un+compte+rendu+d%27une+r%C3%A9union+pdf PDF link annotation
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607552713b522---49873431581.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/22937391334.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16080355da2558---juzigigis.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/livawafufode.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb1505d25e---37683714773.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/gugaxazidawanodi.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/53227082482.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qr1gmnb4o1eb0ajjc49hmrh227/dapojemivalamexibi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a77945a10b4---venorowo.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/10700584404.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/wirif.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/guruburelu.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/2756351372.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a84612078101bbc07e11224271a1981b/5323799898.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/cf9e8c431812714649d876f751ec604c/98411180955.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/23461552235.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160779faf8ac7b---11474260889.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/d233335b837707d73a295cb7d7478860/33736983739.pdfIn PDF document text
    • http://sgpeo.pl/users/file/38481119359.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mhsrbbqs3t78uujlrdjhk8t2vd/56192334067.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/zuzakatigekixiwoz.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099d88094e20---89546650153.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_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 18548 bytes
SHA-256: cb7acf355506fe92775fce6322555f0ffa249404d41b7cb9209e92e2a5ec8420
font_01_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12976 10908 bytes
SHA-256: 1daea41c063990e13d2254bf32a8ac3c212e4050141beb3be69db2330a00b068

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