Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd707d32d09549d6…

MALICIOUS

PDF

101.5 KB Created: 2021-09-04 19:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd7808d4f657f16328b87ec64399de5a SHA-1: 2efd632db329c25f367fab54f6e1bc1f7cce5eec SHA-256: cd707d32d09549d6f83138dadc16e321cb656343ef28a097f43618e607dade1a
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 contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and link farms strongly suggests the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://coretry.ru/uplcv?utm_term=creative+writing+lesson+pdf PDF link annotation
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/xorusafogef.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/notewegunezo.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/23d48ab1491ea8d090144bf00636fd6b/40138690395.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428075742157.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/toxajuwafulimevomu.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/98015046480.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/rjlh8eg6hmkbqo8of8tf800auo/56705889557.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/037e0904fdf3974f614e66ae1c0c32e0/tudenugojolotidazere.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/sodumabetupe.pdfIn PDF document text
    • https://nadamasristorante.it/file/49033631589.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/fozepin.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/37bbf4f82efb4d8a3471ac954bc87310/77401358413.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/55e7400e6d0dc33418f5625a9bc9bf85/72048868033.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6f54fb14---lumaxajefuwuxavazuse.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc8fc9331---46051598156.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/mixonejufijavatibu.pdfIn PDF document text
    • http://master-vin.ru/files/file/41873803667.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3910da02a5---nemakatuvasedonusegusuzu.pdfIn PDF document text
    • https://morabia.fi/images/file/rivodotovulixiwejuf.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e65ff9acf2---fejazur.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac6d553b7c---sileroxukup.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/gukiwuziwuj.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/wipefukizofiguvani.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bc3902fbd---jujamurupedumaburobej.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/64653765176.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dced616ea---21820237045.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609acffd81138---lesoki.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_off00012832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12832 10856 bytes
SHA-256: a0437d41b3a572f88e2ae0d9ab175bf70bb51177f0032ea7c16185d9780912e8
font_01_sfnt_off00014141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14141 18080 bytes
SHA-256: 471a44a2a35525ca16dabcc63eaf322e7b9c05617673576de843ad0b8c5346d9
font_02_sfnt_off0001703b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1703B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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