Malicious PDF — malware analysis report

Static analysis result for SHA-256 828291db12e8ab2a…

MALICIOUS

PDF

87.4 KB Created: 2021-09-14 06:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2af968cf6a8ae5fdfa589ddda13452d9 SHA-1: cd731e167d6402f9d468006f26ac0e4fa0370f48 SHA-256: 828291db12e8ab2a216b9c2a429822c2f72194550ec520dfb9ae7e41ad4d3bba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crewmak.ru/uplcv?utm_term=jurassic+world+the+game+hack+mod PDF link annotation
    • http://ned.ru/uploads/files/jatelawiserop.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zedidimigoporujigitivuvot.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/ramuwe.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/38251768729.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/lelotimenakevovef.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4f12ce46e4784f2bb3283a29cedcf935/kurugigutavivutudu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac36d24df---63299629173.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/40822c9f3beadb31f6f597b6cb0134b8/90779337332.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/eibfo9b6qihjdlod4saulj73qn/dumoxetenutoko.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/posudisijikuvuzoso.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/kosofunazura.pdfIn PDF document text
    • http://sjanzee.nl/file/jupubifek.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/43256362805.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613858e3b9a58---59578026757.pdfIn PDF document text
    • http://jawarakreasi.com/file/derataberoxugowerimit.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/salixojugifunogati.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/verubivozenudukasi.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/lopowonegujizujetukesaw.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/rogujaxi.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/zizokemovixabunotik.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/21370201239.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/kixarulexakididomujunave.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/jegetefelasavolum.pdfIn PDF document text
    • http://meta-min.com/files/masazurin.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/zapim.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_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 10980 bytes
SHA-256: 374f1754e1ade054e975c8bd1eb496a313fda8e66f23c236f5025f03215b5ce8
font_01_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A4 18312 bytes
SHA-256: bf9c41fd313e9ab6d700776b95cf6cb2085d8ce5dda7961cec5ba4b7690b145c

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