Malicious PDF — malware analysis report

Static analysis result for SHA-256 524665adbda18059…

MALICIOUS

PDF

94.5 KB Created: 2021-08-30 04:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 679ced9e78f45a379b836d8b884a92fb SHA-1: 3572cd8b6799d6080d46e334694598885cb650a7 SHA-256: 524665adbda180591e91db80d89116bee487a453b9c75e291f5a81cfd57fa381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, suggesting an attempt to leverage these for malicious redirects or phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://antansconstructions.com/ckfinder/userfiles/files/tedegakesevidasimedirejes.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/01bg1fhevnjls90j7sg2naoodo/karokopipoboralosuzuv.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160733cf9ec4e5---latat.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/repinopekovumi.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fbes2u76me62r2dfqvnv5e8v86/nelavizidifugazewiwuxo.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0de2fa0b25---bozuxatezovonubul.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/bab254b01c583b150d4bf17be4d367db/29412416918.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/nixisozonuwuvesigag.pdfIn PDF document text
    • http://ttc-investco.com/img/files/51126798426.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4361dd92---51243498725.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/14406711596.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/xasunakoguvigat.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/69352788452.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/13884912267.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3e5175da5---konubexafar.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/28224519077.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/rurakudifibawuzowinomepe.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160784ab770309---famukipe.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/rudelulubetubev.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a431d7614eb---wevedaxoxevegasugomekiz.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/93793e4eb2e299072075a2703dbf2cbf/galobixuwufagomekokitoji.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/xunorojolerefozamozon.pdfIn PDF document text
    • http://synergyproperty.com/images/files/bowaziloteta.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/zinuxizebuxik.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/v04burd2nurflm8m378d98u8qq/40955333794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bourne+book+series+list+in+orderPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 18108 bytes
SHA-256: 00dc1e837daffadcbe2254d438f69028b9184cf08641c606ffad8d65e695ac82
font_01_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 10464 bytes
SHA-256: 351524ebacc33c88d5dd9498128936303a70515b7e57df7da67f1b194c85ae01
font_02_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 18644 bytes
SHA-256: 3ffe966f2b4e78e7891efb691cbab1c3b2b90676cd4bd6c73d36857497cbb498
font_03_sfnt_off0001531d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1