Malicious PDF — malware analysis report

Static analysis result for SHA-256 788ad4c0b860fab9…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 12:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18bb7de9eb9c2cf0a537a0c62a9f82ec SHA-1: f0c69bf48e2b71acb13408afadd65ee21c73d541 SHA-256: 788ad4c0b860fab9fda5b7402efe077bf49d766599c42666ad9df423cb885a56
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of 'utm_term' in URLs suggests a phishing or SEO manipulation attempt to drive traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=peppa+pig+apk+download PDF link annotation
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/83640932175.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/podofasutosifemi.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/romori.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b1e3dd8bd75959eeb7bbcec63e38e2c3/tasuvapevudopurekowilade.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/93178670551.pdfIn PDF document text
    • http://apex-architect.ru/images/file/77366728749.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/marukuv.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/3751047151.pdfIn PDF document text
    • https://halkum.rs/files/nexegedegemosajulivum.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/96800916012.pdfIn PDF document text
    • https://reha.bg/content/upload/file/90328017260.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7f6bbd794---zozolojegu.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/99225111875.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/juxina.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219112222199746.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/36613927929.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/verumusadoza.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/44127539742.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/nezemovogiwef.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/xebufobovedades.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0b10a827872fc0ae991196166f0e2b3c/4722470585.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135308e3a1dd---venumeriwufilivebaw.pdfIn PDF document text
    • http://moneymaker-gold.de/files/21538936152.pdfIn PDF document text
    • https://akemi.ro/hirek/file/40618821139.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/fifajuxazijipiturukukama.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_off0000b1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 10380 bytes
SHA-256: 05208ef3b04255bdd2dc4da27e88abe580f2b1e32fcbc2824bcec3cca9ae6f85
font_02_sfnt_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 17368 bytes
SHA-256: c9f0e5d2bfb7af307cefdd0743bdd3dffac4d9fb8f6fe5fdcb57ed07dc42ec1d

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