Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a534a67ae0d87c9…

MALICIOUS

PDF

68.7 KB Created: 2021-06-20 00:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7394ddcc63d5a2db8400286973b1d0a3 SHA-1: 9a6bc7166ebb2aae1acbecf17de59fc4d8506b29 SHA-256: 5a534a67ae0d87c9311efafd598c46b9d3cf9b57a6cebf44bbfac634050cde55
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document utilizes SEO poisoning tactics by embedding numerous links to disposable hosting and compromised WordPress sites, aiming to trick users into downloading malicious files. While no scripts were directly extracted, the presence of numerous external URIs suggests a downloader or phishing lure.

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 https://krisoc.ru/uplcv?utm_term=mogamul+tamil+novel+pdf+free+download PDF link annotation
    • http://pappteam.hu/userfiles/file/jaxixurisasomem.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/bafifivixomefopukapu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/v9coetolk1os3336q1q13ldijp/22105815229.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/3p67lgrvptdq03v3066elupddn/lazoromilirotoxeloxulu.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/704813006.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb538222c---nikidikodiduseva.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c44b2d1b16---xapufatumenonevinumezi.pdfIn PDF document text
    • https://invest.pl/userfiles/file/delem.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/45886074774.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cce5c8c3af5---86576110783.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33af38b36---93501341000.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d48cca68418bb03a47e0d7d2f04b7e14/1783414076.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b5a708fb---givoxutupu.pdfIn PDF document text
    • https://ancoraeducacion.com/images/kavasajejikerugawufike.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608012f413980---xiwakoz.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eee8a5ff1---rulad.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e7d33bb3c89665d1878165fd14ef6794/72361870073.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/370bnt5o1t3itemo49rdj53u6d/49620951683.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BA 5220 bytes
SHA-256: e8c0c541c4a200568a43ff9b6070099d4ec80e33d9df87c56701154c32daa70b
font_01_sfnt_off0000d484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD484 10140 bytes
SHA-256: c05a2900d59ab3c52e2d677661bd753d7917f6f86e22e8107196cee92f6f9aeb
font_02_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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