Malicious PDF — malware analysis report

Static analysis result for SHA-256 83210ac13fb0fe6f…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 11:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 123eb12b7b57da038b6ff1712dc89a6d SHA-1: 635796775acc3e19b114ae103c83a4fec8f02727 SHA-256: 83210ac13fb0fe6fd019cb64eeb75b028b3ef171b0d1676e4e94bd99c11a1dab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable or compromised domains, suggesting a link farm for phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=kgf+chapter+1+full+movie+in+tamil+download+in+isaimini PDF link annotation
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/vuzabadudowafutitofufaxop.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/23776437299.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98a4a96c1---ripulujis.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/tuzuzetetemakejosokame.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/18115718667.pdfIn PDF document text
    • http://geose.ru/userfiles/file/bubixisetijopebaseralor.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/kofekibawofow.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d0b814f4bf8be395dd5198bde12fe645/99443952554.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/zifama.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/punazubimozef.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4e9259363958da6f2a0512907ea79d9a/57723865653.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e38173ae73aba88714d7512be3ba4981/58778816148.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/21651708329.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/boxarinibawuzizo.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/81840394863.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/xodewovomefukujorutapenam.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/bodujodezugexa.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f502367485---40940096322.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/16323188350.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/34949222297.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/xixoraworatozuxo.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/gojilurisatometaf.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/dadimozipodegidudogasina.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/85076327776.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_off0000c94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 17672 bytes
SHA-256: 3135b216d44968a6d7c56a66023c65d66670c49024dda3268ff9cdab5b10de72
font_02_sfnt_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 11360 bytes
SHA-256: 5f3ac2a273fa63113cc51706a41f0a28d95995b4ec5a295d90d272d28c4c0d9a