Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a75484e8e7580fe…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 02:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 532a21bbec0e1195284c7fe53a8e0026 SHA-1: dc2f03a1ee84d0c6673fe7fcd8fd54f942e42f5b SHA-256: 6a75484e8e7580fed9bd5d293c036e925d33fef713e456ff1dbe9851df33d082
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a link farm pointing to numerous URLs hosted on compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the file being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/340c0de69110e968cf1cb154d8585e3a/mamalom.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/o0r04hkdcosum9s1v04ht3qfhl/binakuzemoluk.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/60465479414.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/68165300595.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3d26f019a2528327c55f37410e51f46d/33501180982.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/57863875518.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/wotisawatevudebesazima.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607772b8240e4---defizejidinukebifagomolon.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cbc8a4254d9---joduvanizomajiletifidugig.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ei1k2dsuq16erdfi8bd2m65ur0/26097406121.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/vekepekonale.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/10230443172.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/kosinisolejofuvosenire.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/pesej.pdfIn PDF document text
    • http://fygl.net/uploads/file/10163534450.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16107736fed0a1---50097035956.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/nt9bnc1c32cjpgv36gnfiae0a2/37280012530.pdfIn PDF document text
    • http://erex.hu/upload/file/1793526768.pdfIn PDF document text
    • http://momsystem.ru/public/file/wiwoj.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4ac2766d69cd7843827e32a3da40cf75/90193389046.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46d90d8e34---sivekorake.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/62876217137.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161094a4a21983---wosarikojazad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hach+2100an+is+turbidimeter+manualPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 18400 bytes
SHA-256: 10285ef61e62a9a807e8a80a45f5cdca67d6a4e022b916cfcf5a9a8ae27056f1
font_01_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 11040 bytes
SHA-256: 128c5c87f869c4e6ac07883110d3b2ea08d3d3177834aa0bf94df3730fa97b3f
font_02_sfnt_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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