Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bb8b54bc0458a9…

MALICIOUS

PDF

70.1 KB Created: 2021-09-15 00:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 257382b7df6bd6c48ed95e54a347ac04 SHA-1: 55497a1a9e7cb8b14ae802b8df9eae1b6d094260 SHA-256: b7bb8b54bc0458a906c921f1b84ebe55e3f5e01586cefe9b683bafa8abaf687c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting domains, indicating a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6e8ffcd---87510508156.pdf In PDF document text
    • http://newshop.jp/archive/file/65251328722.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/ralokerisusizobidi.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/pusunugikanumikijimijasu.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/tewakikenimatuzuk.pdfIn PDF document text
    • http://climtech.com/files/files/13055409082.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/79312826966.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3554_20210910021056.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/kazisaminekulux.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/51401795362.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/rosamilojilaxasikemo.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/40087900931.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/rivudutem.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da922bd8d6---44552026252.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140beffaf1f4---mujopuxutisuraxuvixug.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/17179660034.pdfIn PDF document text
    • https://mcrlclient.gilcom.ro/ckfinder/userfiles/files/90688463173.pdfIn PDF document text
    • https://12shio3.com/contents/files/nijesifikirememunotepo.pdfIn PDF document text
    • https://shinaltd.ru/images/file/63905411675.pdfIn PDF document text
    • http://vce34.ru/attachments/file/jiritobi.pdfIn PDF document text
    • http://ossokahve.com/upload/file/kafubijukizu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/54b9e137dcb0630df429cdd38d1c23c7/11719004967.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c75aef342862661e8fcdd0a005ada21b/23378801885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=wonder+woman+1984+on+bingePDF 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_off0000b2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A1 15300 bytes
SHA-256: a686a7c17219d2db3e3f94425a374b0d58e884c9cd0104e862ca1031cc8fd98d
font_01_sfnt_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 11004 bytes
SHA-256: c6d62a94cd15685a854a62f14e69598a8cb100bef0ac7a4006e7eb65a1fcbdb8
font_02_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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