Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14469f2c06835da…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 12:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aed264e005c0789d7e0f9f4754093c7b SHA-1: 90958d9bf10c865da5e06ed54f631278a1be4bf8 SHA-256: c14469f2c06835da17adb7b6f73beddce1441f2b373b30fc5482658adaff1ac5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nomylo.ru/uplcv?utm_term=calculate+the+temperature+of+4+mol+of+a+gas PDF link annotation
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/48c08a471db02278feff741a9a537d3d/gofewidatapet.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9313547f7b---24809760866.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sl30k3nbs7fingecprc43lk4s2/melukawilofuzedifafabo.pdfIn PDF document text
    • http://planbmedia.hufiles/jatufujo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0a78e029---5455218840.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/mofutowonuxepirez.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/fewul.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/dofavozi.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/1062294822.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/8476e67a437309d38a3e94667adc7c01/lokukubiw.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/vatekipasirejupo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a859aa68d15---82819431225.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d40205b6---87077089295.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/jajopivavo.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/56453253417.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/nugovigulaposifuti.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aadd2ddb127---visexepikulupox.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/lidurasidusaxepulofilozut.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/23788006799.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b9befbf0d81f86568a3f052e035d17a2/26183466537.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/90341479874.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/tenakenewu.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/97724130607.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/dubabolivonukuwadumaxo.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/merejemorowemapuradavo.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_off0000dbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 10940 bytes
SHA-256: cf7ee3c599f2412b6d23c649a817f2f2a5fd68221b5da20d94f0aeeb3398fb60
font_02_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 18992 bytes
SHA-256: 3b209b6edb00841b4fc3a11d4b4610d72b9a03a75633c117c235832ca597ee3a

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