Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d72758dfba5244b…

MALICIOUS

PDF

69.4 KB Created: 2021-05-23 06:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6cb9a7447bf8d46364353c5e4fee2178 SHA-1: 61c06270a69417abbdf018dd53af74a1c5d03db2 SHA-256: 8d72758dfba5244b33e780386346901ede99d9fc37d346e39a0f8904585a98af
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing a secondary payload. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e556c6794f---tifeduvimusafoterilagasi.pdf In PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6dff2cb8af141bed9c7b17121ddbf0ba/98375282175.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/lc882ap4cbbmtutvvnd1u59qkj/40227212096.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/r7fj1ueag0as9n6t4scdi5um80/libapigujuwukipefafuju.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc21a85455---safot.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3fd78915---gejatidoxadobezegizami.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482cf78bf8---34316435851.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/14488465383.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/5d0a6ppk0246fggbn7h8nsn790/vusanasibibebegu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d669ae396a---momewunususozafemigibut.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/81115969260.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609613c08d64e---72835525779.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/47142078585.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c28ee028699e73bc95f410d8b240cec9/fakevutopabadojiwaxufo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a010a6d1a5f---xixudebiro.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7960d4e672a824ad4504d2124fb8b676/fowupamidolanavuwa.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/66645248587.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=acs+study+guide+gen+chem+2PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 5240 bytes
SHA-256: 4e22e0cf82d52a747498a7314416df4c0477c3f804501c400e83f54c1d6b5b1c
font_01_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 9976 bytes
SHA-256: fe19f2b5c32048bbc0eb92100b4ca8ba832d4124c3e07beb9e15562743bfe986