Malicious PDF — malware analysis report

Static analysis result for SHA-256 b886bfc476a87590…

MALICIOUS

PDF

121.7 KB Created: 2021-08-14 19:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a10d0f1ba6ae22b5882afbee1971c89d SHA-1: f07fd3df9f76b1d48bc8852ae10ef8677c15765e SHA-256: b886bfc476a8759006aa2e1d026f9d5d22b05ace1c02510d35245cffb6a1b910
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://proia.bg/userfiles/file/15165961152.pdf In PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/vivoxefuxavoru.pdfIn PDF document text
    • https://j26clean.com/upload/files/56349014716.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808d3d36e79---jabitoxodavelaxe.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/fisirapotu.pdfIn PDF document text
    • https://coluer.ir/documents/file/poziv.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/bizupegob.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/00196f7b50e5c32873dca06534d71c4f/92386636159.pdfIn PDF document text
    • http://medi-sen.com/files/files/91038665323.pdfIn PDF document text
    • https://highrise.pl/file/dugazizuzoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db88d9f706---14434196059.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/27203035033.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/tedolabo.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/jesajiwitubikoguromirupej.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/786e5f4b7a4f5a44e3e4802b5b514a8f/xezugogevigonij.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/qr8opucho9jubcq7409evk9jr2/tuzirojetilizazilaw.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/tulofedawopone.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113efa858228---7647233865.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099523b08e2b---36281315558.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/dff211fa572ffe84a29124e8874274a6/loximujar.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/wopofituwumisupofirifa.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/86402458383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=zelda+wind+waker+dolphin+emulator+downloadPDF 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_off000169b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169B5 10732 bytes
SHA-256: 4113cf66cc2e346f6eb7b163367b44fbda06ff34f48e7b900a8c193de4b0f501
font_01_sfnt_off00018226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18226 17920 bytes
SHA-256: fbafdacb253c124463e210a0bec152cdf073450d12dc2999f9db11eb8861198c
font_02_sfnt_off0001b10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B10B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001c918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C918 3968 bytes
SHA-256: 534c2d98cd769b0e64ea8333b1d1721d650ba09bfeda52ac94032f66bbcac9ff

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