Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8f7594cab2449c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 05:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1992788b83d92a88fbc80ce6db841775 SHA-1: 6d1a9fba2750554a9e8a835b979989b4b394832e SHA-256: 3d8f7594cab2449cbc0b2fbe26a7b34a45016ec5aa5a129dfd7747051695541c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to distribute malicious content or conduct phishing attacks through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=stridhan+in+hindu+law+pdf PDF link annotation
    • http://ttworld.hu/uploads/content_files/files/wemaven.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f8283ea99a8---nilajan.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/tasarobo.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/3720376445.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef5610bd24---83734822534.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/9ba6e36554c047ad8f44a03dc81c3085/27066632543.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/jexunudegimomoregivagoxab.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/48781818942.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/17342778669.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/38067427847.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/njm5osk9r1c6co68msvt5fig12/lirepuwume.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d16e8087af4c0ac8e867ba7d92332bfd/32620443434.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/50418613428.pdfIn PDF document text
    • https://areicon.com/images/file/87956109795.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/u98fetadd9omgao34ee8n5cper/79944354781.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/24413684383.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jp7rfkotvm6jo0ajbf7g8oklj7/xinoma.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/93bcb9215cfe2fe10dc1336967610f50/76080071252.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23d569833---jadetajejitudajivojafap.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95bcd3430c---womitamodupofisabowenuxib.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/bufadatufokisodi.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/netalise.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/nojid.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 17480 bytes
SHA-256: 1af92f4013fc67350e3a45beadb14115dcea7d5638e941253b402505007dd20d
font_01_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 10436 bytes
SHA-256: 23363ee87c6824471eaa9e20a8441da2a22245c312b5a9e2ba0ec4077f2c6976
font_02_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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