Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd7779e7b46f87f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-11 16:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7baba3c3a54293ed7176cece32858f3f SHA-1: 47d09226e62abcc5c0b37b48a291597022d15b94 SHA-256: 8dd7779e7b46f87f45b21f58b7381a841191359235e22775dde19849b2c62ed4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://botroul.be/uploads/nojamemapelopako.pdf In PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/parakuzofemitugevedajepad.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/80793672040.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/mowiletovilu.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109031334034221.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6e827043f---xijexufilixaj.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/29243903019.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/tenixem.pdfIn PDF document text
    • http://dolonchem.com/upload/files/xufezubetof.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8080666e46d211aa7a048ed8521eba78/fakimanufejoriwo.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/48103942567.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/86704674905.pdfIn PDF document text
    • http://clingac.com/d/files/togulifelu.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/muvegalelifoxedajuzir.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/wetapofako.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161309dd2b4c16---1941498526.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/dapedukiziv.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/61150839589.pdfIn PDF document text
    • http://ipceurope.com/assets/file/80941960971.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/45404626122.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/35884832514.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/26156054291.pdfIn PDF document text
    • https://majubesar.org/contents/files/19765697623.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/1193752792.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/zoradujorowikijasexiwot.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/85704378752.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/98129599620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=growing+up+ethnic+in+america+pdfPDF 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_off0000b781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB781 16092 bytes
SHA-256: f2f97677910648ad4f496f11fb822f0c74f997fd714be98b0056cff24c3b91b0
font_01_sfnt_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 11076 bytes
SHA-256: 00416e86dfa12f1608d584ad0ae015da864d7ad548bd00caf0ea6c538d36844d