Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68f0d0730065561…

MALICIOUS

PDF

89.2 KB Created: 2021-07-27 16:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 44fd697664ff87a3f7c35fc9aa519f92 SHA-1: af7a870bbd403919a0b474f6da9c149e1d419329 SHA-256: d68f0d07300655613e4a684e0d47a2118a2a4383cf4b18f01409002f0fe10e9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://alexanderkanevskyartistbiography.com/clientMedia/file/697777800.pdf In PDF document text
    • http://pho32shabu.com/uploads/files/5956660066.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b3e43400ea9501fa5c2aaf2b8c9b5c47/devulimafidixokiwogunev.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/80697208898.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/47499797429.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/pifupivupu.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/gudawopamijapaloni.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/31pmhm40ctadsf4h6t3msalsu2/jowimifasikoduvim.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/xopuwubilibe.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/29937616583.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/sufiped.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/b640p118941evvm5ogjmp8msm0/lonizevupedudetenivese.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/10483086866.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/bapidolitukuzori.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/63279073444.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/jizikos.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/gimekesiveko.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/gujotenevuratot.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/pogupabolokomeguwapituni.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7640b3e312120f3f7ba9c44503044e00/41298153500.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/44249321124.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/garulogagadenabafavalogu.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/94986827322.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1ctb51rknktrgti5lkj4critu0/81028751854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rinnai+heater+error+11PDF 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_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 18472 bytes
SHA-256: fa5fa1ea3d2d70157c4af23012cfc042d2d671c199e8aa2017cbcb8a2d2e7c0c
font_02_sfnt_off000140c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C2 10088 bytes
SHA-256: 9ab7392bd84123f834538085c1038fe477d5f0354c05fc96df36e7d2421973d3

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