Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0b9346ab5a0861…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 07:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8843f4995b2892ab6332ffab66e0fb29 SHA-1: 47211fe1526adeed18998ac393b4c5d7a0bcc1de SHA-256: cf0b9346ab5a0861cd8a0a88b89bd6012a6dea68872ce9c287aa1fb94d3fe94a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://alphasigmaoverseas.com/userfiles/file/17810680823.pdf In PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/tuxarabusizow.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/85943689859.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/belivod.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/lozodimokutokugigisor.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/29367084056.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/berak.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/51027832077.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/tawuzuma.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/newipotefunapukinawex.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b537d80eee5---foremafaloxegatisope.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/tisadexide.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/41342798315.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/61221891120.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/walagojugijaradajopi.pdfIn PDF document text
    • http://planetamama.ru/files/file/sajisepajalexawo.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7ffd27bc6---99548557141.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cc506a237---batuximezidawojijinodik.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161183e2fa34b4---kavujisu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7d82ee5d---71608291933.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/pewizupabowepojulorone.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c114932c58a---82527664240.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/fimebafejigadujovonefow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=netbeans+java+gui+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 10820 bytes
SHA-256: ff332ff264f6e19cbbcb02bec70ee16ff720a777dc0bd0824d6c10676acc1b3d
font_01_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 17580 bytes
SHA-256: 75b7d75804603769d806f6a0c537c10005a609d2c17946cb9936db2dd8b0e82d
font_02_sfnt_off000135e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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