Malicious PDF — malware analysis report

Static analysis result for SHA-256 d617d150653285ff…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 00:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3da5ef320a63abc9b628b3bab92f861a SHA-1: d20b259da9ca63dfa6f1b529c97f69d3d41d5c3d SHA-256: d617d150653285ff6e12c4f843b51300e870ab919691afba15ca7d134df87566
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://reviewz.eu/app/webroot/files/userfiles/files/zukipolojudanemofida.pdf In PDF document text
    • https://jokerprod.net/userfiles/file/18042049981.pdfIn PDF document text
    • http://qa-whg.net/upload/files/fowebo.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/4484543540.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/85295260716.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/5843435823.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/lepadovatofa.pdfIn PDF document text
    • https://isleo.com/i_photos/file/suwirunedisit.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11470ea80f---rotajajafifibifo.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/tumiruxisazolikinasaga.pdfIn PDF document text
    • http://herve-coiffure.ci/files/favupegizuzelirawowono.pdfIn PDF document text
    • https://reniuved.it/file/zuxulinevexa.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/85294228674.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/80859403249.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/312f928da60c63f6a798fa6876d4685c/rizumijewalebamag.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/fivigikexawup.pdfIn PDF document text
    • https://theurbanthinktank.com/files/52874982795.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612d83949028f---juxabapasiban.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb92899bc---zilomamupuxebasujota.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/84110652496.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/392ad31c445e884ceca61bb839fc0057/wefati.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b08aef194---sikelilozuremokagalu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6e1fa1561---10209314839.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e58b4ab78---jumovopobuzivuwalazugax.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/kekukisomijugif.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7fef0568a---suwavuwol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=systemic+effects+of+smoking+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_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 18564 bytes
SHA-256: 984852a815ed506a9e4035946cedda068838e5355eb704a61c5956fb08e2be2d
font_01_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 10936 bytes
SHA-256: 765130a93e33e1f718f6e0cda86a8f80e18f75b48b17913c6913bce3e559f026
font_02_sfnt_off0001350b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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