Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e217eac630ad52…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 09:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33163d37bf2c2635a3ec98b81170f610 SHA-1: 8d9dc55996ad39f5c884ab14454ffffcc44c5c8f SHA-256: 79e217eac630ad52b72863ab338da0f810fe06c9066c60ed5b33a39b21be3e0d
196 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a link farm pointing to compromised WordPress sites, likely serving as a lure for users to download malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick users into installing a fake browser extension or update, a common tactic for credential theft or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c85dce2f---gulelosufoxuratuvojo.pdf In PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/kozapexa.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/e5buv0fqcerorc95sm03dt3lf5/45863290574.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160da3c36bb019---lebesepofilu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612c84dbacfb2---dufofamovawakasenadaxud.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qlfom2l7m1e2oafjvlk7iflnkj/kizikode.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6bebaa44---tomevutedafajanavizev.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/87969231537.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3dd2bec2---kepasejukojewawakizimeju.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/nagigutezig.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/42386209571.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/71631257736.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/zixilutiwoguk.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb81e0188---94826396797.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/42725327766.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/nitonigelevipozutar.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/7531454627.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/81854383306.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/dowalage.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/mipakotuxonirepudibabakuw.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/i5mlakjb4t322h7iv2ebm2f2ek/74120982218.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11e30bb34c---519665063.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608681a56835b---43737533181.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc58a323022---72010008409.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16115362450ef3---3024255204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=screen+recorder+for+windows+10+for+free+downloadPDF 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_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 10704 bytes
SHA-256: c5d989d8d7f132f645610eed1449dfdc8d502e7cde8270f2890d56be5bcb085b
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 17832 bytes
SHA-256: b508540b0a69f3561372d0eaffca3848f6384cf3b44d340caaf3d0af163dea10
font_02_sfnt_off000125ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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