Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a5d56699a5d074…

MALICIOUS

PDF

94.5 KB Created: 2021-06-27 12:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 315773324daa75584030136bc248b6f0 SHA-1: e65c63954991a0c7e119f86d11315033783fc286 SHA-256: 85a5d56699a5d074fec38f3c6e437c5565e579129453f58e74d35ba508d0d90e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, 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 potentially malicious sites. The embedded URLs and the PDF structure strongly suggest a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/1bc05a83880cc44646ffb0d4717a9788/10840809595.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48861deccc---60443240842.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/193e8e70447ecf02087f68321b6d7626/tutufebowexofavikut.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/bogibowuwaduzijuxofup.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0be389d0---leraw.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f04169490972a1b7d494964debb844e3/wexusag.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607105bf42f16---netepodukujuz.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/41490567599.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/rageligotabe.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086293b8cd96---wixolekamudotaredolunix.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/junuruzolivebi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/l6o96qkluqfevn7muehm3gvgf2/75479478942.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607addf12b000---xufibute.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3029531d60fdadcc841729e9278c73f3/xapomom.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/669720e2ad033191c6257318ad28cee9/57014153090.pdfIn PDF document text
    • http://laduses.nl/image/file/32241499369.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/585d792f5a809a6d35d67d4a58b47a1d/zukolezejufeweputorubo.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/sadebekiz.pdfIn PDF document text
    • http://billsky.ee/files/file/64337404974.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab076a6f4f4---91464469940.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/80044884388.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd41d3545---83255876178.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a1f8a48df---90821484524.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/9nsoqgq0s7ib95np2b7u14ak5b/mugulewiwebonipunewope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=deficit+disorder+meaningPDF 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_off00010b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 18132 bytes
SHA-256: 147c21eecfb7dba3c520a40e01e94bda4fe1d31dc7779cd7db560b5c70c764cf
font_02_sfnt_off0001529a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529A 10776 bytes
SHA-256: 1d8d1d1ded8de3974acdcae294129815473313c81f41cf60e8029d0d517f9adf