Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65276a282eb986c…

MALICIOUS

PDF

85.5 KB Created: 2021-08-08 01:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9444fa25aa1c26d58f35833f558c915b SHA-1: 0d25c76d2564ebcb93ed2db62bb190af43e1b4e1 SHA-256: c65276a282eb986ca69ed3b5083a59b04370798bb38c7ee65f235b437e730bdc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable domains, likely intended to lure users into clicking malicious links. The presence of multiple links on potentially compromised or disposable hosting increases the risk of users being directed to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://bangtaisay.com/uploads/userfiles/file/6148884123.pdf In PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee5a68565---namutumewajomalefej.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/69693188000.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/761670975f5302a88033e4a35d702a9e/10081530627.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/suzowitibomopepapo.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fpqbhk9ce23un6v4l1ns9at9dr/4782920253.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3d1fa50a4---devazijoxolimo.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/ripemuzak.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64b9b08699d76f71712e7a5259c9cf89/60974230570.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0ee29c816---98936423600.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8ce16ebb07fb73be32b20363506ee313/64265951096.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///56988112996.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb514e8bcbd---75007277782.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/xosofamileporozudak.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/1018369921ac7c4da1ddec69aec429da/4138317101.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/dda6eb756d1739e918af557e495997a4/fisopaxixarejal.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/39346827167.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/d3gqt042malsrqrntcc001aech/durumiku.pdfIn PDF document text
    • http://samtekelektrik.com/files/99909682910.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/navojadafidu.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///47818233778.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d4fb4cc9e---tokalevuwusalawumoko.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/97382309343.pdfIn PDF document text
    • https://bauarch.bg/files/ximulawipu.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/59582233638.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160764bd6b7f45---buruxaferirubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=candidate+elimination+algorithm+example+malignantPDF 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_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 16972 bytes
SHA-256: 5ac8ed1a56b06ed538b42080c5c25320ab1b0fb050fac93474ce88bfc8b5bb31
font_01_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 10804 bytes
SHA-256: 3ed734c21095bc1d1b9699d72f3c2bd0b6fbb237d71c6bb449bf82a93026cb4c
font_02_sfnt_off00012f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1