Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc032b8795b5248c…

MALICIOUS

PDF

87.1 KB Created: 2021-09-05 15:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e8235b2efa7a99d66a6ef9dc4c53a4d SHA-1: df9f7e71080b004af6d0228c4363e55bd362c796 SHA-256: fc032b8795b5248c094910d5e152320ec9a71fcbb804f714d7b29df88903cd53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final destination and evade detection. The presence of external URIs and link farm heuristics strongly suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c843ac3ac0dd2d4570b18fe795ff1714/3570617405.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42aa4cca6---97877994173.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9f592965---69741956183.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/kilogugote.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/96120705012.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/21027717828.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/pekexuletu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80f0be7b1---59679298067.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/54796312634.pdfIn PDF document text
    • https://themalc.org/files/file/pafavofezomadagij.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/dd815b9c04a1a537c311e12f8ef96fcc/56886094715.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/69149090250.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/58917363214.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/60131114506.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/79118926571.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1704072456---71464857288.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/48086728110.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e2163c84---bevulilobovoli.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tiwuneroputupujise.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/zafupugevogaroxivinedova.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/pokumejaxupepuwiwaxuw.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/febulemakitisuru.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/kasasobupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=programa+gratuito+para+convertir+pdf+en+excelPDF 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_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 20272 bytes
SHA-256: 5149954be37a85f68358a47601a8f17024ee49dfda3c1f592b6fde1441fe237b
font_02_sfnt_off000132eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EB 11064 bytes
SHA-256: 246ddfb968508c27d01b8f91a7ecfbff94a01c69a597c30063921a898863bc31

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