Malicious PDF — malware analysis report

Static analysis result for SHA-256 df337b2372d8f596…

MALICIOUS

PDF

84.1 KB Created: 2021-08-15 08:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b18bc53b81572e2c677f69ff0b1cd764 SHA-1: d407ab395b11d4988901214d886302d6df90c28b SHA-256: df337b2372d8f596dbafcdcb4727976cde5ff801101ed7606d12781e5120793b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gagiongvitgiong.com/ckfinder/userfiles/files/rugorukexav.pdf In PDF document text
    • https://circolodelpistone.ch/userfiles/file/88602013427.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/81598111759.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/kebuxalaxagowilagepipeba.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f317c522---59257236899.pdfIn PDF document text
    • https://healthandetc.com/ckfinder/userfiles/files/11813245137.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd8680770b---5952736959.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20c1ba1e2---jevanusewufovukigimelufag.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9lmvaol6q8drs7k0c35p2i4p9v/77126754736.pdfIn PDF document text
    • http://centronegozi.com/public/56986168727.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/5rtgl2jmpv23c7mhja3bn8e62k/pufaxugufenasi.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/45328775307.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872ca302f54---38965566499.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/jajetuligekujanute.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/47756909246.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6tblu9j9ir047dt1h80vos0567/xalojegunojumi.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/29959090029.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/rupufukutat.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/namaraziwopuwedasesureves.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/75090377703.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1407ed4ea3e3443117203c99b622bac1/ferulilomotuludeburovuvi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b16858cc5e68bf2b9531f27c3ddf2e2/66007967299.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/92606924975.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aed80a42a8---zixesopajasivijupenuloze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=shakespeare+sonnet+30+summaryPDF 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_off0000e283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 17196 bytes
SHA-256: bb48961296085d87875c25200ca99204e4262e0f4b17ca0320f714e9a3f02855
font_02_sfnt_off00012701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12701 11056 bytes
SHA-256: 6fac3042e251f9c6cf45d5910a0ba940855e9f71aeca81963d6659aaa4776029