Malicious PDF — malware analysis report

Static analysis result for SHA-256 a931ebedef3fbd25…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 15:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c653be50bf1fbe63edd1418f488cbec SHA-1: 2085fa8cdf80439ee4de098101eff7c745d3dee3 SHA-256: a931ebedef3fbd2584ae486ee4bb827a5a9a4fd27a14f21367b0e7bde87ab5b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://infrive.ru/uplcv?utm_term=dispenser+in+malay PDF link annotation
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608391fe5dfd7---81570284461.pdfIn PDF document text
    • https://marigabung.com/contents//files/vanidaratesetare.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/84956277626.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076b4ebe2b1b---ratarulutojitixepad.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/79886327268.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/67704620468.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e0f29e371---xebatakidupujejanurixix.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/93676784982.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/95262586030.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/73668732046.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/62fd8bb86a2dd1601544bf1b8d059c46/lobovutugoxutogopek.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/jedemizuxam.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f28d9b3f---witapojatupozedomos.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/sirodosulup.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2a9ed728d92a3a77de2f5fa20b3b6a8d/nixedemodozimo.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/15549938627.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/mosategoziruba.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3649eb2862124d995a04018d64b65666/mirudoxuxezatu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c2ecbabe---nomekuze.pdfIn PDF document text
    • https://everestart.com/images/stories/file/xilemoroviri.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/98490802826.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/kekibiminawejudixisukav.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_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 10308 bytes
SHA-256: 0b9c27e661c26cda40c77ab1954fe5ddb6af2be98f56c1932b5de00d43ed4b71
font_01_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 18112 bytes
SHA-256: 7c31f398c8b2614b81be635be5dc8702215a4bf7119d67b97b993d97a584ded6

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