Malicious PDF — malware analysis report

Static analysis result for SHA-256 9540d6b50f9e1e09…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 09:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef112ca1fa9eea22f10f63fd916fc806 SHA-1: f976bd636b06e9c6e49e4eb4e868349070fc31c5 SHA-256: 9540d6b50f9e1e0942c160496ef3a29ab7e04ae5f3f949f2306f8f6b7e9713fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=adding+y+to+words PDF link annotation
    • http://malbreil.com/userfiles/file/gunegiju.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/r9gtb21a2c98cu69h2suoqq34q/wituvopaleb.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/vovunoxog.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/xofiva.pdfIn PDF document text
    • https://hirurgija.me//files/sobisogokumakigilenasiner.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d73b6e311e828268a531459dd8f18844/61128888003.pdfIn PDF document text
    • http://wohntraumgmbh.at/44130922939.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102cc256196f---balov.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/davizonozozajimu.pdfIn PDF document text
    • http://sentai.cc/data/file/20210829_023537_847.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/muremusugow.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/86f1e12537eaa0116eb23edd06b14248/viwaditigivavot.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d929b860d---xokebudiruvefikurer.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210715090613.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6f1df555---fodajomejomokuxad.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/liwusunofovusadogejusapem.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98199518926.pdfIn PDF document text
    • https://olterus.net/contents/files/fisuzaxulo.pdfIn PDF document text
    • http://korytnica.net/data/files/63745220895.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/73244603666.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/357303301.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/tq9ujnot6ls5at8tdbajb1ggqp/48290444099.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_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 17136 bytes
SHA-256: 53501b1535231610b05acb3e191ce17872c54c4609407b54477b10ee40f26fb7
font_02_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 10264 bytes
SHA-256: c963b46e56ca655e66dc5a0b65ab102f626c085fc659521fcb6c6a098f5abfb6

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