Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8374210bf7df38…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 07:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 980df9814641b6591de2224fe9a4c16b SHA-1: 68e1bcbf7a3d6c624139875bc7d4e86017ed9883 SHA-256: 9a8374210bf7df38bfab05bcca4a20c1ef3c1b9427d1a23c092374a34da1bd22
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable domains, suggesting an attempt to lure users to malicious content. The document body is unreadable, but the heuristics indicate a link farm designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=divisibility+rules+for+7+and+8 PDF link annotation
    • http://gardena.crazyrockinsushi.com/uploads/files/51302663312.pdfIn PDF document text
    • http://yilip.net/userData/board/file/rozetoge.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145dac9c8ba9---22579009078.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/57032200225.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210902_F80C8F923B5B6D0C.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161322e20e438f---2066745411.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/17991035245.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/67893732624.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/guroxuf.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/geriwuti.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/80464576705.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286b02b050---97626673224.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/16374877966.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373085a4a96---8381439151.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/87597203707.pdfIn PDF document text
    • http://getvisa.ru/images/File/17593476156.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/73650566735.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/xesagodutekax.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/99808535566.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/v1tq648qmotodvrtjhjr2tdlp5/judunuwow.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/dojot.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/patagifikudulomoditugar.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/96197604489.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/53398902148.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_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 11028 bytes
SHA-256: 2e288c6e3201112c9ec704f58f5b737c90d995dcbfba628d92540740fbf52087
font_01_sfnt_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 18200 bytes
SHA-256: 56e865ce5ac88793ca1b56264cec522a0cd0c72b22c5e167a757371df87bb035
font_02_sfnt_off00012827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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