Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ad99f70fce650d…

MALICIOUS

PDF

94.8 KB Created: 2021-07-01 10:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e5b1d969ec4e57736aa645d052a7db1b SHA-1: cf98d8498fce5783fa8e02dc728bbb200282435f SHA-256: 71ad99f70fce650d4207f60fb9ead47865ca0123e53ca54f1bb3e6489402714b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0a3aed8a8---1069484589.pdf In PDF document text
    • https://bleikss.com/userfiles/file/kekasowuwav.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f74ea67a---valarijate.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/77e87efc2404615cf9cc1de068da9f86/35964745805.pdfIn PDF document text
    • https://ecoretras.com/file/razuzi.pdfIn PDF document text
    • http://fxmeat.com/upload/file/cd3ef53d04fcf86c87baf1b47cc7e171.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9ab3e33e5205034f2e333061bb6cca89/26678559709.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/kaxigerogetulefutiviga.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608132359e73f---feretinudevewipuduxuwonaj.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/sde141armcj356bsouqptmdha1/87548484462.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b83ce415325---migimurawusatapato.pdfIn PDF document text
    • http://slsnn.ru/content/files/wevodasapiken.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d7658b70581bdc47924a32a94112b763/49785132339.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/t0dnugnp5856qg020kaptbbpkt/revisivefuvizofividus.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/lufofokigatamup.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/nufiruzokukisolupizalo.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/392jnbd4i2masrqe8ken7gkpk0/67600747221.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a486050a46---75076566911.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/l9874b51opu3rdsl5u4dsdv4q1/jafefujelasusavatinirasav.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/50579090446.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa172f85871---87999728100.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/eoi57uvk2kcq1llh1d7u5pcnsg/87281952060.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ee9e3ef9cce5a36b821df20e5e4b2bad/21820811434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=scout+guide+the+zombiePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 24144 bytes
SHA-256: ee55d6524fcff37996c92be6593a0500e13f40c6c096bb5bdf3460d9072d1bb4
font_01_sfnt_off00013c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0F 10612 bytes
SHA-256: 3578dea63e2436389ccf0947692a7edb7a0fa588d058c2ae7ca63cd9f6267371
font_02_sfnt_off0001542e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1542E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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