Malicious PDF — malware analysis report

Static analysis result for SHA-256 837131e9a539f3f0…

MALICIOUS

PDF

71.0 KB Created: 2021-09-10 22:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0bf81b4661a6479b3ea0848920de0e00 SHA-1: 680fbfee75e1f00542b90a85f44c28462ab494c0 SHA-256: 837131e9a539f3f06cd793e03a77c1c7b7b7408cabb76786e2c286b45586fc5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=custom+navigation+drawer+in+android+example+code PDF link annotation
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135aced52cbf---95759316322.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/48761858716.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/71482431842.pdfIn PDF document text
    • https://ferropula.hr/files/dajinu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361c138353---busuxotilen.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/situgetulazaxeguwazuv.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/katubazaredubazobuzaj.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/56751858252.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/radamupuberesokutovupo.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c108bd154beff076d4629126058a40b4/73999943905.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/35367471297.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/8177339844.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fofigawoxukifaz.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/fibewetanazesigoj.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933ca4b46f---lomovevulewemanowitopo.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/63469948990.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/bumugaxike.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/susizanijivabegemox.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/kemajadabasefer.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/konunejulaxaderixit.pdfIn PDF document text
    • http://erdbau-rauch.at/zafiv.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcab394197---kuvobezimemegolimemeso.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/47709963440.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b2f9151e4---kimajitaveri.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/7291577218.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_off0000b561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB561 11240 bytes
SHA-256: 0dcac921b83b77d3d04f7132694199ac6e9b1ea676d6ac6b1e7687b104bcee91
font_01_sfnt_off0000cfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA4 15132 bytes
SHA-256: 5b35a270f9e85ef6c7c15ed67c90729618786e10642c05198199cce8bf465d8e
font_02_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1