Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0c3ce5cbb4330e…

MALICIOUS

PDF

87.4 KB Created: 2021-07-14 00:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 27b9b3d8fb3e075cccd59e70b7b8cd04 SHA-1: 4a85494cd0aaca6c34236e722eee317bfd576c07 SHA-256: 2d0c3ce5cbb4330e0e6e294512c1a30d6f33075c3a3050655ae6252da0ce5dfc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, with a high ML score and ClamAV detection confirming malicious intent. The primary function appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://krisoc.ru/uplcv?utm_term=no+skin+off+your+back PDF link annotation
    • http://ranaghatpchsschool.org/userfiles/file/nolupumazijufififewanofiw.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfdaebd824---21397303996.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7feb6dca9---75677171192.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/vexufadurew.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac8f2ea56---ropoba.pdfIn PDF document text
    • http://aps-mes.com/files/file/96951592371.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/zuluwixodoz.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6db1a498---fimudotijidenilega.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbcbc00e41---zolupimula.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/61316297801.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/83170302391.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/625f8d72aef760251fb0604a8b878bc4/xudimuvomipu.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070314412693.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/628pqr0ehvd17pclt92sai342p/64178219723.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/91725764152.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0blciddm24iocl2mcm603ubqsg/misinesixelinapa.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcffa955e0---nemimisa.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210612_6D2435F830E98E9F.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rdkpd4hh7elvmom3rootum6dm2/39292283553.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/rolawirizotupikipuz.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/jezeremud.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zizopenopuk.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_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 10476 bytes
SHA-256: b5ed5b9db338a946f5d2b211e85cf158a8e58ce830d5014c437a8972108a7c29
font_01_sfnt_off00010bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 17188 bytes
SHA-256: 0cc5bb046cfff4b3431ba221ded442b44911a892c688652a947aa0b30a596dd0

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