Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a74188d6ee5021…

MALICIOUS

PDF

96.6 KB Created: 2021-09-08 02:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e17e562f6d0f505abf1a7f3de45819a SHA-1: 61c08f96dd9238c65929055ec40aa54d49aa3a60 SHA-256: 79a74188d6ee5021f4a43db6d8e9a55d2e0c0899a2bef56fa247ed620b22949e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous external URIs pointing to various domains, including compromised WordPress uploads and disposable hosting. This pattern suggests the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=telecharger+convertisseur+pdf+word+arabe+gratuit PDF link annotation
    • https://callmarkinvestments.com/callmark/files/82855821477.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609479767ff87---zazeder.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f434bc24b0---kituranizafud.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160aa63c402f9e---30711936537.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/57638789087.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/jexoxarulodoz.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c097a240281f8a5f8198f315460c0625/boxapo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/82426287086.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/pazubitonifusenezoras.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/90824723071.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/21014939884.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/lefuxazedakuradopib.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/47135184094.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/danisegipuje.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202108052035467901.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/tasamivalitevelugota.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/waxikede.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ec53d41---13247912125.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/1109495567.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/pufudisobopujabe.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/p8226c9ulh9teoitc4cfv6dnu4/lanasupek.pdfIn PDF document text
    • http://armanetti.com/images/wimelegobatitexonuxu.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/matibudebilipi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128199e0561e---2112715551.pdfIn PDF document text
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/bepuragimedu.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_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 20340 bytes
SHA-256: 72019334f5b45d4cdbba480fc7157a733c933c62b3be9084bcddec2a4732fea9
font_01_sfnt_off000141cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CD 11256 bytes
SHA-256: 97987cbeb49388f11438a003808a01a348b002612d41b9f441d9a5bab278f2e3
font_02_sfnt_off00015bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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