Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10f0c220d223d2c…

MALICIOUS

PDF

121.4 KB Created: 2021-08-25 16:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c0ca28168c4dcdae392a3767dccaa769 SHA-1: cbfa4392fde6702647bc0b75025fd04d0e993ad2 SHA-256: d10f0c220d223d2c9aaa07b267d7636098e2a921e2029e20eee438ad90aa588c
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to download and execute additional malicious payloads. Heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The 'Fake invoice / payment lure' heuristic further supports the phishing pretext. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://globalcircle.club/userfiles/file/janubedekokakex.pdf In PDF document text
    • http://www.toptehnik.si/images/zizaweb.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/59643805705.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/25546044130.pdfIn PDF document text
    • http://ubest.ru/images/file/puwodegusuwetigopexop.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092edb9abb3a---47355742451.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/tinomurufawejorifasekol.pdfIn PDF document text
    • https://pasargadhotelsholding.com/cache/fck_files/file/juniwokixirosunopuvudaw.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/jeraludulaz.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/75215583231.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/figikigijugepidelen.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc91814b0a---34093844846.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607102de9d28a---15357251766.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d54e09d60514bc6442dc2de377b1209a/99043695422.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/88491193098.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc43613e2f---luduxelawepiwudab.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/c9rhfp9641hg8i6773hf2prgr5/58159026191.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/gadibebova.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/jajulova.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078bde6ad9e0---85264520226.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/betaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=contracts+act+1999PDF 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_off00017aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ACA 16920 bytes
SHA-256: 265358f0c20ff4accb04586a9d32cd0ad3b1076f0322f848094b879a2851a3a1
font_01_sfnt_off0001a709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A709 10204 bytes
SHA-256: e6db0998fe047d7a9fca2ebe47036fd72d47d3f4802234867016ed7b7f00333d
font_02_sfnt_off0001be2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1