Malicious PDF — malware analysis report

Static analysis result for SHA-256 624c44483e983bef…

MALICIOUS

PDF

86.8 KB Created: 2021-07-04 06:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 310d079541fc7e51dfb3349b7857fe6f SHA-1: 21bf6ee0b389ec7ca153d6d79eec4b28905b23e8 SHA-256: 624c44483e983befefd4b44009e3af59ed7976f3e4c25fe95017a5a109c2e459
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified by ClamAV as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it's used to distribute malicious content or phish users. The PDF's structure and the presence of external URIs indicate it's designed to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://crysiq.ru/uplcv?utm_term=baldwin+filter+reference PDF link annotation
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072902c5b05c---29889487519.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/3e7ba2d12379233ca1d9093288dff144/fasijapulibebuzofilulorev.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/wigilifukitilavemejovap.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077b517d8839---befaxirigiriguxavetej.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b46586549e4---20444529508.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/gulolipolezibu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a2950f405---kujigeropodiw.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/mudizoga.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ad0c1526---wusiboponorolo.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/laligafiduwaga.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/olnv3cdgap20v06rv63hajsdrp/5219550874.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/jipabaked.pdfIn PDF document text
    • https://medtek.vn/storage/file/vuxebotub.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/m48reo08clau7hacok54vo7qf3/nulavofutafaz.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da266ec55e---zatati.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608990a35fb2a---wisabazomazukibe.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/notofumerinoneti.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/60843834582.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a8eb7af8e---bogakururaxadakegenirak.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/41308878966.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/78103171053.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb723f8b9---monuruxoke.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082856b8eb19---finuwotinapiko.pdfIn PDF document text
    • https://luminex.pl/upload/file/dobugafuzuruze.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3658060fc53b3e6b9d079c56898db8ac/90178726673.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 10320 bytes
SHA-256: 3b521df8686eacc283c7d4fed0dd461b927f303215048fe442212e0b2a4a5bf3
font_02_sfnt_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_03_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 18276 bytes
SHA-256: 5d82c9b90bfbf360ccbd8be67cd127be5321b3a6472040fdc9fd0be96825aba6
font_04_sfnt_off00013ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFE 2688 bytes
SHA-256: 9a130951a291cd9bb0a397a879fce5fc13faa3b3cc1a31c8f2c143422cdccccc

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