Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4b84c71f95a0d1…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 14:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfd9da54caee384d2bead959c2e0ced6 SHA-1: 56a0e172176e07ca44ad71c073519c12f976f1d9 SHA-256: ad4b84c71f95a0d1f6412ca7ce82aa9f43fa7d713ef84e1d6bd9b63b343d2db9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malicious files. The presence of a visual download button further supports a phishing or scam lure. While no scripts were explicitly extracted, the nature of the links and the detection suggest it may exploit PDF vulnerabilities or lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=download+perfume+the+story+of+a+murderer+full+movie
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075769de8cef---taveziwas.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acff3763e62---41200294911.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/bupidirunulisuti.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/fojeginojivu.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/gifagifugekad.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12377774942.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b2d9335a1fb4b197c18a0f52423cc2c8/rimivo.pdf
    • http://robedecreateur.com/img/files/bogaj.pdf
    • http://vdadanang.vn/app/webroot/assets/files/newisaxemekixemalovukobil.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087663a95705---79871187271.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2720a80d3---85214852031.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/datitit.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8da63bc582907b030ff5e4400773ecf5/24690570481.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c17abdfd545dc5172a9e06951e57e3c8/68983716882.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609046a526fd8---dimipotovow.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf08481752---99973553221.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf3bedd83b---wataxakigugulepoduxes.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/8b5673f14801e2da409ccaab4b6d04e2/letatikesaxigevem.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/6e5bdb3b9746ca43b10b42f65acd17c4/40286220304.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608c62f51040c---91764309672.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7e7cc172f30bdeb9cb201838fb37b03a/36284089719.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf468d4f5---21467441200.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3a2c42f3---rolijoxoruj.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55368e09f6---tevogafirarirobum.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c4.bin
5e9f9727f834e3785d1692ae56d80e741bef51c703bed606aed86c867ede5773		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 17288 bytes
font_01_sfnt_off000121c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 16792 bytes
font_02_sfnt_off000139d9.bin
7ffb511064eada11dcedd2839cf75c067c8dd2ceec9dd8fe1945abd7647eba5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139D9 11128 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.