Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d039fd4fbf3363…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 21:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c2b8ca4e8477d9e8962ea8c5a457f759 SHA-1: 90141cfba8c1580595128b9fb4856e1b23b33a56 SHA-256: c1d039fd4fbf3363a8132fcf55c8cf3ad3454e51067929291c4add80a0150524
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://buildinggodskingdom.com/webcms/file/14550553727.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/bb621f4d345d79327a4313755bf2d2b4/66156579836.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fada9e02eb---96244888836.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/296dc7c937ddc8c6e09ef370672de2dc/80190281920.pdfIn PDF document text
    • http://deauville.ru/files/file/volobivojepeb.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fae3b2843631f187b8bf0718f594063f/63973300581.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e76fc5681a6ba4c5a311e29f1f6d778d/67053504086.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd9479fd35---13099965331.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/63584655473.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/jozotifabomopusanat.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/desadimakewasomoxutupoxa.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb02b777b8---4370978705.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/10163815894.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f426413d25---pokisa.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c42eeac75f2d70dd93205ec996c2b76c/31695427345.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe97fbb765---jufuki.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rk1nt919lpi1ddv556k5u7vnoo/11668889902.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/81757806158.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a93ad4988---maregubi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1831c391ed---wutixax.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089bc5be1e1a---vuzaxes.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4e01583909090a2a9d992abb5f7a886b/85223312816.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c93edd81209---50007935834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=after+think+gerund+or+infinitivePDF 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_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 17732 bytes
SHA-256: 17330f83f13556578457c88b8266feffb54cbc858b4dd1498caa9c6b5541d83a
font_01_sfnt_off00011a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001328f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 10496 bytes
SHA-256: 88ea0d1a71ac19c28bb0c05ef2c30bf520c4499d2f39d3174251dff2bf6c8e2f

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