Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c75d927511d7c3e…

MALICIOUS

PDF

113.9 KB Created: 2021-07-25 00:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db46abfc19ddceba0d84bbdb7df56d53 SHA-1: dc24edb576037b11b52012c7f12ff0524eb78165 SHA-256: 8c75d927511d7c3ee5e1ba1298b6ad376dd599d48a494ca79546066d4007d181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are designed to appear legitimate for SEO purposes but are hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malware disguised as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://lycee-elm.org/userfiles/file/vegidiw.pdf In PDF document text
    • http://boekenwinkelindex.nl/images/uploads/15132564238.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/40087489143.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/14859162411.pdfIn PDF document text
    • https://tipresentoio.it/images/file/boboputaziwopukajide.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/sazomunexedavetozumu.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/puduferitenurogedovamuxiv.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cbe5cd566---41891826652.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90987cee9---nevupe.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/rnk5bdco6ho8slq8f9hrrm3no1/balopito.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d9d609472---verujojunopeja.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/75803605641.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/2202477385.pdfIn PDF document text
    • http://funperm.ru/content/file/13491653166.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/79747890396.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/62173488090.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/78945106600.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0b58954d---bipubobexig.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af04d021b---fudibiravivagoz.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45f462d100---lunatilemolasop.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/kuxivirerubameno.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4d6a997b3d2901ca6dfa0c167563a256/rulereriregixez.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4c3a6883---xonakibakonodik.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/53713768224.pdfIn PDF document text
    • http://zipansion.com/zedR4shared:https://shon.xyz/a/77242/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=descargar+opus+2016+full+crack+gratisPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 18104 bytes
SHA-256: 4df2659b1b96fbe41fd46e2a5a7e3313dbc93454ae7d58649977228dc146e373
font_01_sfnt_off000160f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F7 12112 bytes
SHA-256: fe7f5363cacb6e669237dc603cfb5117d241d543904e4d2a860ba7df82f2082a
font_02_sfnt_off0001860b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1860B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E22 11204 bytes
SHA-256: 9431a943c57fa550ac8ee33261fea9a8b627776a319faf3aa2b46a50e0bfc6ad

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