Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bac61b5182c4b4c…

MALICIOUS

PDF

85.3 KB Created: 2021-08-07 11:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5bffb664b8057551557322e732e473c1 SHA-1: 1cde0a24da743cb07ce4fdb71553c5f50d69adb6 SHA-256: 3bac61b5182c4b4cb8937502391527bf51dc6c68d3d0af47b898f6add22ad75f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9974

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://allytemp.ru/uplcv?utm_term=subway+surfers+online+play+plonga PDF link annotation
    • http://kokomo1986.com/clients/31029/File/13086990884.pdfIn PDF document text
    • http://gptools.net/userfiles/file/kirumu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160859a9406f42---zatoxamenerasufijud.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/kamivititijabos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fdef2acc0---17609513580.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/zoxawitoxiribalorofatiz.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/bipikipokekixebetur.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a986aa1a79c---bepojujurogoxigelafuvedek.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/wewazetawetosibofek.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/hvkcpvfv7dravkh3mibb0vamdf/64769344299.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/pemukuwekugenogevifos.pdfIn PDF document text
    • https://actor-conseil.com/files/file/92223817933.pdfIn PDF document text
    • http://medrea.ru/upload/files/tawed.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/1614399510.pdfIn PDF document text
    • https://apizf.org/public/file/73895689471.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/35105718659.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/bizosagudonilo.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/8265316.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b34a059874baf11f2194e5f437bf36f6/68842626081.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/92016807302.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/goxok.pdfIn PDF document text
    • https://armenia4d.com/contents//files/19100340321.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/22893271779.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/65071319190.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/b346jqiinckd1t7pijhfsif2dh/53794049572.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 10952 bytes
SHA-256: bc338fdb6da087fbb38527e4e21e3f1c46cd2ff0e57cbcc15d0fff7459896462
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 16748 bytes
SHA-256: aa7cd82b4a4eff35b2252b5b08077cbbce532ffaa9c32d08becaeb6af0a392ff

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