Malicious PDF — malware analysis report

Static analysis result for SHA-256 293838cb48d78cac…

MALICIOUS

PDF

105.7 KB Created: 2021-09-06 02:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dabbfd6b381132dac1199e043367dcd5 SHA-1: 9d6db92d6fe46ffd15bef856c1ae119dabc41c50 SHA-256: 293838cb48d78cac78ba849ab13a85349e78a89a14d12229403f9ee60a9625d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xingyeknitting.com/userfiles/files/jeravoge.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081beb19174c---sirosolasorume.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdbf5b46a0---nunarisof.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/lavuwejeridav.pdf
    • https://mttrasportisrl.it/dati/upload/file/7193721657.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf1090784---kidetorebafajepovekaxe.pdf
    • https://666666.vn/upload/fck/file/bukakewikejalolezuwivifuz.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/38151147553.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4gf2fqt09s827d73h2oiovi9o0/zewamurusifu.pdf
    • http://reklama-kemerovo.ru/files/files/sogakigamirarufajugudivo.pdf
    • http://www.ezmoving.com/file/sufif.pdf
    • http://k-ookuma.com/js/upload/files/84937006233.pdf
    • http://cozycornerexpress.com/uploads/files/binaserajadejumage.pdf
    • https://pjkconstruction.ca/images/file/65248287629.pdf
    • http://bananamusic.tw/uploads//files/202108030448474478.pdf
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/bopizojafukadabudevowira.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329c46e4393---78460374958.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a09d8e1c1d4---54839794099.pdf
    • http://anandtouristcorporation.com/uploads/bufegirukolataxatubu.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/pogitelirelap.pdf
    • http://schs1968.com/clients/861610/File/milafa.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d8790d7c409f19a6de5ca1c2a0d6a596/1525797298.pdf
    • http://marcelponjee.nl/ponjeefiles/file/robutinupaletavuwovi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dunn+and+dunn+learning+styles+inventory+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135AF 16792 bytes
font_01_sfnt_off00014dc1.bin
ac31b421c8a89607aa506d08acd919129a7e486a2d1575725044624f30158632
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC1 19148 bytes
font_02_sfnt_off00017f65.bin
6510dddd8ef0c544333adbb0b7ec1491a7b10ee9521c5df5b452b9b3237e6768
pdf-font-stream PDF embedded font (sfnt) at offset 0x17F65 10952 bytes