Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e3267c3d5ad4c8…

MALICIOUS

PDF

74.8 KB Created: 2021-06-10 21:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8b77349d3fa7e4131dd85a353864b29b SHA-1: ad65f25aef9a36202ba7e120049491c2976fa9aa SHA-256: 67e3267c3d5ad4c8c15782857a299326e85e34af7de835851a06e8911f4d5f37
96 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to various websites, many of which appear to be compromised WordPress installations. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of numerous external links, some pointing to disposable hosting, suggesting a tactic for SEO poisoning or phishing. No scripts were extracted, but the primary attack vector is the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://archism.ru/uplcv?utm_term=use+of+present+perfect+progressive PDF link annotation
    • http://aliceinformaticasrl.com/user/pages/mimopoteserowurerozoxi.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/80099279762.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e75709c5---tisotigevirovig.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2p8fsltv7d3kaok051u7e74f73/zisaketumumuliselenelepu.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/c0cda765154e81391e6a60291c3b6e73/levugizesijixo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d81f4eb4d5d7ac80d6a6eaf2a234133a/32040709341.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9de81e62cb3461f97c302e740d3bbeb8/mepupokoxamujujamemoguri.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/17356577622.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/60053017551.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/6j0rcmq6nbkrh971d1rlaft846/xelejerolije.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/7a023a926e3e038c4413548e18aa5c7b/vojefefasixirajokejizilur.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a001b4d71ac---gujumuniwoxubi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/l6o96qkluqfevn7muehm3gvgf2/75479478942.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/77cf394cd95c3739a5195dd7076dab38/gibiteduzabiwukufivowato.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 4992 bytes
SHA-256: 14c93f8f435e9eeb6ca6fbf80a7cd2ba79dbe942fc350f0753cab9114b0892e3
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 13020 bytes
SHA-256: 951f9e6b61fabfe65edc847318a4f8a5e2af4d91ae80b7b1e96fa9408777e567

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