Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b4ecff252ce8a3…

MALICIOUS

PDF

86.0 KB Created: 2021-06-20 17:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aace9b453d453b56822676ac3db46f18 SHA-1: 1f1f965b4c388f9f7cb696cd8f4dbdb755d49784 SHA-256: 65b4ecff252ce8a3d982094be6ec6856185893c668bf7b7a613527e7e1aedf7c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, suggests a lure related to downloading free music, which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/uplcv?utm_term=gujarati+krishna+bhajan+mp3+free+download PDF link annotation
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e753cce7f---xuzofiperajifez.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7789a0683---tavegoz.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/07qaos5b7ujs2mdjndte4rop4u/68872296245.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ab27a7b17---jedurebawi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7pm8qsg82rd5mufb3lt0jkqk33/manawopenulefajiwes.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/b0435e841a31212fa4d40940a7d3fe16/21489470811.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2dce5423486ffc790ff5127350d886f3/29302679935.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc40ac014e4---32991575425.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e1cbdb75---73868029132.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/78ugrqkab45v13710v4776cmgv/mafeved.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ea2946eba---39575900732.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/05321dae92b109c97620769f126771f6/36672449268.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beaa6a93500---kefumazebu.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/02137e3271f04123e0150932afbdbab8/kekoraleduferafubitipe.pdfIn PDF document text
    • http://jarosi.hu/files/file/janeruxilij.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b7172d8db---37372950183.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f41cc37b2519e5d26ab12006a70361f8/lunusiluvewagazovisibazep.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cf380a8bc53f0c1f359ec91d06667a0a/82558436221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000118e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x118E3 18312 bytes
SHA-256: 22a931c3b07f9c1549efe0ce6cccecf0fef5a3bf0239732ba7929da44056393d
font_00_sfnt_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 5848 bytes
SHA-256: a80a151a453b5320e6b6368f2d37a15a0651cc6ac7543dd7d34a19a304cd17eb
font_01_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 11572 bytes
SHA-256: 60c7f05d2e8b730e4fdc8dce4a4d36259553d81cdee5d916a40f494489cf8ebe
font_03_sfnt_off0001353f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353F 5844 bytes
SHA-256: 3431898070fda05687e32f483a12aa76aa0c36949f9fa0cbcf37942f8b1ce0c3

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