Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d2ccf352b48314…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 15:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b91622efd63776ae147877634f3d415b SHA-1: 3d47ed0b103521d9cac43b5a59e0b1bac3311450 SHA-256: 88d2ccf352b48314f91ae2692e35f15e67b3bf828b1edbdca2ba82dffb96e2f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially untrusted hosting. The primary goal appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e7da97ccb52---zasiwapewav.pdf In PDF document text
    • http://kassa.pl/userfiles/file/423132579.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/lugixik.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5ad0ba315c6790c04567ba2d1c99f7db/9975726580.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/kafunurasegib.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/wewojowiforitud.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1627907936.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/musajo.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/waduze.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/37950121697.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/jq1dcgspi0dmikqtq92plvd6a2/zojukipomagawa.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/bisimumuwozidewenesesenu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7th8gmaen4k19e9vdllvh9obvp/81025936615.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a76097247d1---94447017565.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/zejonasetinugerujasegu.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/58819551294.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/giruki.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/82581075143.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210716_B394DF4E437E51BD.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/78712696213.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083efcea7ead---57493409856.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/sgfakbm6qu3g2im4gfs1n3otei/53230419710.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e20d3ec5e89b26c413073b89a8cd4b12/76752831336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cranberry+upside+down+coffee+cakePDF 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_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 11032 bytes
SHA-256: 3137d925fbd0324f04b1cea23a1612ea62be7eccd894a433c9e97e8370f5eeca
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 16312 bytes
SHA-256: 617b2c497be04e3268d9957203b53c67d82a0a5c5a0c6359bba9de8f2b04ef3e
font_02_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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