Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b39d803d816502…

MALICIOUS

PDF

109.0 KB Created: 2021-09-05 22:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15b72561a8eda01951f4ae3d120a5223 SHA-1: 0446477b69ef580f1057a99d08a7c7d69cd09440 SHA-256: 36b39d803d816502018771c08e2e40ef20d17448103f1b4a1ba922373cea5a12
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://okeefesreef.com/ckfinder/userfiles/files/23110584340.pdf In PDF document text
    • https://stka.gr/ckfinder/userfiles/files/sejoxuxafukudavexijugabag.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b47f1c241---16830360147.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/tjq87o3bb16kifuki1pqlon795/14599203763.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/fudopo.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021081602101641.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/tajavuj.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611da8a34e296---7617769629.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a26198c9d1---sevevi.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/volovofukewolemati.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c82b87bf8ec45eca6c0dcfbcc7a7682e/87901089422.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/fevoxilerodigopade.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/tueho7m8aqsa3lpmmjtubmlic2/46290022691.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/92375438287.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/jewuretagugak.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/19910978109.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/jesorulolivam.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076143322c51---35268812383.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/duzebokewegatalena.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35ebab9a27---41247569112.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sisegixeximuvolemabi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ce35b678---67974358204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=worcester+bosch+30i+erp+manualPDF 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_off0001442c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442C 18432 bytes
SHA-256: 45884ff62fc79e5cc6715fba21d6d5ba5511c5364b5bc7c8f658c80ff1cd6594
font_01_sfnt_off000174a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CBC 11168 bytes
SHA-256: 999f0919435fa7589dfd713d963ef486f8ba3885f37477dc05fe2c5358359f2c