Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c25250723d70cf…

MALICIOUS

PDF

167.6 KB Created: 2021-06-29 10:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6957011664110922caa1313bd1da2cfc SHA-1: c31b09e05c4b8853df5a122f49d213d24daa2051 SHA-256: 98c25250723d70cf020c2b8c5ae670abec72d0645e6c64af397c5f91fa028421
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://coretry.ru/uplcv?utm_term=best+sonnets+ever PDF link annotation
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e39139351---moromadunuje.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c097e9c4d58---68042082275.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/vemusedisujajosemamavogib.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9be9ba024---95402054306.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/77aedf17161e8f553240a248f1764c1f/jimifojiwedeb.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/b6kha4pm19qhoun16k80r94bk2/39165511233.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/janipobe.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f74c772bb---wojakonezivel.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/derevejoxubap.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/mifusexivowidobeme.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/fuxowazoxamojiku.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/85266468443.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/76f9e11d1b7aded1721c5030757fe007/pawojajasifutamexexope.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/xujilosizadimukasuborazor.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c05a6d4ca---54666054848.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/63710918a552e03a61721c3084268524/wekudopoxekugo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af53b86f10c---kinulutitap.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b310e3464---vuxozufidepopom.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/1afb48b745cecdf549e6f0bda3760d9d/57153833785.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/d6lco4i7frfqp0u1jqbtr7ugs9/18262849557.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6847d0e4c8---lofax.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5286196946198e810e3faaeecea4ecb8/4783913672.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sedavejuxedamag.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23612 17192 bytes
SHA-256: 98bf144e90116803caf5ce6622dd65bbd8364623396e8e43c292bef5545be929
font_01_sfnt_off000262c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x262C5 9920 bytes
SHA-256: cf239a39a8797227e256a1e34fe87b8d57c037c66433b289ed5d30b4326a8ab7
font_02_sfnt_off000278de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x278DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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