Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac9365c97419cfb…

MALICIOUS

PDF

74.6 KB Created: 2021-09-13 10:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 585efe678ce16fba2716e25be42d8ebb SHA-1: fe2e53055a8c2f10618aadff9fea56a512dd42f7 SHA-256: fac9365c97419cfb0930afdc784ff3312feccee60cdf9bb65547716e65ac3311
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially malicious URLs, such as 'https://queure.ru/uplcv?utm_term=free+chemistry+books+download+websites'. The presence of numerous links on disposable hosting and compromised CMS uploads suggests an attempt to distribute malware or phish for credentials. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious lure.

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 https://queure.ru/uplcv?utm_term=free+chemistry+books+download+websites PDF link annotation
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a18e4e91a---pizikorojajefezipujadidi.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210905_082609.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/tiranalip.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/15377656324.pdfIn PDF document text
    • http://teifsepahan.com/files/file/genareguzizodesiw.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/wutoterakafulepof.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/pixaren.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/76191659885.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210901_161559.pdfIn PDF document text
    • http://standdominica.org/files/files/jitap.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/29228545109.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/94434565100.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210906_6BB1438DD34A9057.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/60143004422.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/31615765899.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/purereg.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/77492300469.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/denumigoketesubixozu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/fa426b665d332887a9099b071b128f11/delugijubividujiwif.pdfIn PDF document text
    • http://consade.com/userfiles/file/47441783698.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136490f4d938---26991689188.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/45303055823.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/27640860266.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210908_144420.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/52957528999.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_off0000c0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 16316 bytes
SHA-256: b62e2475e03f4c3b0776453a62e1b87c990848cff068c9b771188e0731ebf582
font_02_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 11044 bytes
SHA-256: a12163632cfdf84dbccd202070a93ce077b9c364bf22712517b99c4ca509eedf

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