Malicious PDF — malware analysis report

Static analysis result for SHA-256 356174c9246107f5…

MALICIOUS

PDF

79.8 KB Created: 2021-08-14 17:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 59b27bf545d4c8e8d298d1c068c2d6b5 SHA-1: ee41ef072188fda0bc23474e0367ddfc0287f487 SHA-256: 356174c9246107f587be8f83dc1990419c61fb1790658e7342b2cd39f084b25c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://aiswaryamatrimonials.com/fck_uploads/file/luvegum.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949ebb94369---40272285770.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e5a844433b9a4f7de9bcfe29a9f61ef1/2107385528.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/zeseniditeza.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/81915982255.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/dosululanovexi.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/ginajapafofapuz.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/rodagetudefe.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/sjrgma2vthh2jedh79i133hb14/pugulasumamononapevojoxub.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nq9nir07ad027mm3d4a61br923/dekuferifafixasoxizugowug.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5gl9jpbrku637a66gj10h3krdq/nujukemivusonaba.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3cdaf86b---32475582055.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/nenijir.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/xavilirawovugobi.pdfIn PDF document text
    • http://guowangcable.com/d/files/nisezobimijolulizobulamu.pdfIn PDF document text
    • http://whatdwellswithin.com/file/59885628274.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160d28099811c8---nudilasug.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/saxepovedibetuwewef.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/21ef7da6740686054f30b7a28807bd69/tulijamulinovudom.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/badutilawejokositomubepu.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/71286124770.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/fufukovakegazoniwikunu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/584213c340d0ef5f3ce300e729e4bc12/52668808535.pdfIn PDF document text
    • https://robertbah.si/files/file/larifuzemejizarozili.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/nutuvo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160846fd014f9d---soxomaneru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bonding+cast+aluminumPDF 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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 16264 bytes
SHA-256: 561faf22a36871ee160476fcae964688747966e9a26c116ee851c8edeefa5a5b
font_01_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 10632 bytes
SHA-256: 016628047bad2f852c83caa3dce2658633d99b6b80e8dfb23eaad6c745f20707
font_02_sfnt_off00011952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1