Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b15aebfb0cb106…

MALICIOUS

PDF

73.3 KB Created: 2021-05-09 23:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7eb74a42aef201dff64b957d596edf03 SHA-1: eb542c40bce316681a7795efa71aac00765070f8 SHA-256: c4b15aebfb0cb106a92f0902fd5c9f3ac8a9cb83ea113be78997c95bd4167f12
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm or phishing lure. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=fire+safety+plan+template+bc', are likely used to redirect users to malicious content or download further payloads.

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://infrive.ru/uplcv?utm_term=fire+safety+plan+template+bc
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbb298d6a2---14135801127.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/dca002d7b4cdd7cca711f58efeeca06d/siledegafo.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608785bfec959---neriv.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb827e50a---18053391412.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/692e16b61dc7c537ae1eb1f9c339d772/49137022225.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/09c6a33e425d62c4da7d9e2d1e1cdf01/raruxakogaxeje.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874ceb94676---davibilaseva.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b685d34015347442e6ce959106eb1326/sefabuvunafa.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1d903cf5---28477379619.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc365eab3e---pijanogizumagokunitin.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/9a2a6orphljqh0ssnlpovcrpk6/54606283954.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160941172e7680---41516932408.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/445649e4fe5177687b1b8200fa62c0fc/22650983543.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c878eeeb08---81059112478.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/aff8b6b4e711ed893b901f3991c5d97f/joponefimugupejivep.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/22166159585.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607271d80820d---demokezame.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/aea465599d40889ad113d83f35f7d2ae/7731199918.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e18066f9a3---fuzisisoroxulivakaluxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18d.bin
084791363a5da0555b5bb982bd1e7ced6cc9b40523282494cb6249816d5f3c83
pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 5360 bytes
font_01_sfnt_off0000f3c1.bin
f34f7b23b03ff630fd53627752236ddc7b79e0c95fa6e3fbfe02895c2760cc90
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 10680 bytes