Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8d3180db76a0ee…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 13:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6105f61e0bbc00a59ba3408055def358 SHA-1: 5d9f6c51c9d05e1eef371b24eb73faf1bab06793 SHA-256: 5a8d3180db76a0ee5cc8115e02446b0aa1c3215a341632b9e5fde51a07d7c57e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://isotech.si/uporabnik/file/kamuweza.pdf In PDF document text
    • http://tottazo.com/userfiles/file/jonajufivavizowikaperomi.pdfIn PDF document text
    • http://school15-tyumen.ru/f/80577777002.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/97579876258.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/niwapop.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/10241951251.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412ac5db787---talepi.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/86d759ac3055b536da40164aa9eee0ce/9118096344.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73852002811.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/zukotavomegadediw.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/84470806113.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/tilap.pdfIn PDF document text
    • http://peoplefoster.com/pliki/18762056122.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140c446c3852---14203917693.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/14898664817.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/kipumixup.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/dugekufuv.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/19268889786133b18d45aef.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/66102172591.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/tejarivagumuvapazorenuf.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613553592e130---wirosesidodejusisonokapiv.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8b5b7c67342b0e3d9364583d6f85c057/wagosex.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/kerubenununoz.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/70749908709.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/xotewigisetuponuzekoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=have+to+must+worksheetPDF 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_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 10464 bytes
SHA-256: c8bee6a2d3bc5a86ba53cc5b9094d2ebff376a9d1fae686ace28c0d8edd53174
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 17200 bytes
SHA-256: 7d2e0e5a7a7ce9ba3345857a97f2a59b522ede93ff86a8bb3a07f9e2951c52fc
font_02_sfnt_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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