Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c59ce81d4dc705…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 15:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 400ee49d830929979fea9689632ddd51 SHA-1: 5dbf630c57cf7bdac4a8002b4ba4d70a0cfa3a0f SHA-256: c5c59ce81d4dc705c623e280e55eaea49e3e2601dd7919331d83c47aad905d31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jumpinfit.it/userfiles/files/26690913001.pdf In PDF document text
    • http://www.romanschatztruhe.de/img/files/jadasodugibexis.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/wilaxelufulosawigufa.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/73141755879.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b3907144ec43b40f3c6526a5a6223fb9/rumifufog.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/tagilaguzisonupetoz.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a61f7d4ff---73316744132.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34856477965.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/datomuzuzonuxozodo.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/79261284746.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/ratezarosomata.pdfIn PDF document text
    • https://micsys.in/userfiles/file/semikaxe.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202191652364647.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/70fe24a5774b0a266176c467786d856f/40879596121.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144bdede521c---sekamiwo.pdfIn PDF document text
    • http://azizolace.cz/images/file/saduzewu.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/17124655667.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/98813095884.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/16330220242.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5h0eb7vhje4uvpod1s0vn91kf0/katiwisufulisutupez.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091519492029.pdfIn PDF document text
    • http://hybsch.it/upload/file/kavagepuv.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/14544470285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ios+14+keyboard+androidPDF 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_off0000b1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 10524 bytes
SHA-256: 0fd566f2bb4fa0df80dd4b660e079372e9f2c95cfa311bd323123e2f773d5ac4
font_02_sfnt_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 16208 bytes
SHA-256: e027251fca0b13f2a1c45a0456e7e1e2460394b566709d238e9aa7b5c570c296

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