Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d93efd608d92f3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-11 09:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6daae46a58c2e9f2573ceb0c7b5df85b SHA-1: 5a46ddb573a3a482d01a8307e88e9534be19f425 SHA-256: f9d93efd608d92f3d5a4ae922b39f8216d27d488b5d21bccb416b9df43277612
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. No scripts were extracted, so the primary attack vector appears to be user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smwebtechnology.com/arishayurveda.com/userfiles/file/53428714398.pdf In PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/pekuxifiriz.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/mujinodonitujidowurisada.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/figisuso.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/99a45eb5bfc2ec4bebb94d76695c69a3/58275454911.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/dovedexobedig.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/63596007881.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210909084659241.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/31909491079.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/46052520253.pdfIn PDF document text
    • http://mobitransjogja.com/files/9626136641.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/59960198613.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/92669552644.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/rajav.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/55380030380.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161312d8e468e5---vikawozesike.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/pejivuresodixidu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mhtg455rii6gq8unnh6tk1j9l2/61713391083.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311e24e6d01---manogapux.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/48215766948.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/9424819082.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/82974678599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=chromecast+with+raspberry+piPDF 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_off0000af15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF15 10860 bytes
SHA-256: 8b4cafb55174f61b54aeb6cccfc7704b2ad9423db4e0923772a5d3cc8e46483e
font_01_sfnt_off0000c81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 17696 bytes
SHA-256: f5fd551157d8371b0710170fe7e10fc081b72b0ee1816094858ca9cfe50d00c8
font_03_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59

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