Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51fba647f604397…

MALICIOUS

PDF

87.2 KB Created: 2021-09-07 08:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: affdaa3548ab2e40d9854c2b22a4e9fd SHA-1: df4e9e8e50da8ff90f720b1b791ebb2f6fe384ac SHA-256: f51fba647f6043979c3a71eadbb0fc375623fb32d81f22e26632e6f0aa52f503
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. The file's structure and URL distribution align with a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d12e2a29401d4a965f40d2243a036ae9/77879249015.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c9c452c1f---devimivanovabaxofakilo.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/20188592949.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/febaxilirabopofirutugi.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/17515662712.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/43962334432.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/fuvoxosibaromopemumabixuj.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/wujegam.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/982251dc6cfe9bf660ba789851057c52/29997975913.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108882ae9c30---9986740828.pdfIn PDF document text
    • https://phr4u.com/files/91282106720.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7d5c37c0---latojurowob.pdfIn PDF document text
    • http://beiks.info/public/file/10641915886.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/zebepozebefafemubavagixun.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/cnr9f6aehg4dlj4ai95mms7jke/45524847457.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161072f5c4dcf1---30983244492.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9842c18693---84156892911.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jl7gaslv4hnbkd4rs4j3qk66bb/89342066379.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/vejen.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/gurujuleregujo.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160814a2595454---megutegup.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/veniwirufanonaposujabuxug.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/sg5g9psir9sa693mbbkps46k95/tudosisoxibudiwerimotexuv.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309dbd99d5---zofigiva.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7168b51318614e0918fed421e8d19ef4/tifiluwifeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A7%D8%A8+skills+for+success+1+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 17792 bytes
SHA-256: c84608986354ae3c3a71ff5b5a9d3b477eca203e8d38df52e8639b037155816f
font_01_sfnt_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 17488 bytes
SHA-256: 87555df4a1695d9d3591893b45e0ed085aa6312c7cd10de7e7751d3ea39b65c2
font_02_sfnt_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 10396 bytes
SHA-256: e4fcd55999e682c0a5cb71b2a81163562dcbb82bd75040f1628844f50a55545c
font_03_sfnt_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 21312 bytes
SHA-256: 992996c94a21aad9e30c27469fc7828329b5b687013515417080e34706d19f6a

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