Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a463eea72b3efc2…

MALICIOUS

PDF

104.3 KB Created: 2021-05-06 17:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57867e40acf38a10eb3899c1eaac11ae SHA-1: 906b6c41c5d1eb4ab1ed0d6f29dde90c63e816d4 SHA-256: 6a463eea72b3efc2ffef7f33c9493d51f88e8605baf19d0fa7577a2026b564cc
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c87qbcm7qv9ene4kqmrsv1a9v0/nulisaxotupib.pdf In PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/084cdb98d4a59c9e03d8620947684a30/vejidixofuvuzimegozi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16075099a0fde7---36910276593.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d96b17df7---94971796776.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/46e469c772fcf8aefff98b6e935405fb/60556368270.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/550dd79f82ef85c2866a4fd0dcafb4ad/depijode.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ef1c2f8754e60c649c2c30d59dd6889d/vexudemudekuji.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/71e3dec971367d378137715f9f0f3d50/xekulibuviririj.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4e26441b---76665977603.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d9722c21b---35258402065.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606da1df99f48---xajifegewex.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/4mi8903foet9h8q495r0r7cejt/pimut.pdfIn PDF document text
    • http://arslanemlak.come/file/xepagumetebutuwefizopanul.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/f11595d91fc7f5a2cc0c21a2d950d060/kofuzesirep.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a84eb83c4---46014688241.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/45633a8fbeef8189f8830a2b5b28ea87/gazijivurofevozi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca7d58a26---1831162888.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/8b28a6c6291d916f97da6d4529bad85c/ketilokiduvatezadi.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/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kingdom+hearts+2.+8+trophy+guide+ps4PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 25456 bytes
SHA-256: 122aceb4eab36b4cedbb6474ce147f2e85bbe2a4ecb9d9261781bc1a5e59d249
font_01_sfnt_off000158bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BB 5856 bytes
SHA-256: d96902f321045e9f8ecab3e979861ef0bcdea412aab2ed9f73a361834bcee280
font_02_sfnt_off00016c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C9A 11616 bytes
SHA-256: 843611894f2b891a911a937db751ca0b6d290617b584c843000fbfa4465179b2

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