Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d3294ed32ff6cc…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 22:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24b9e28ccb593b77d8a76853d8670cb5 SHA-1: ea89f502dafaba7f0d8c280e5ebdc55b3e5ce435 SHA-256: 85d3294ed32ff6cccfd4b5bfeb22f82eeab1223ac257e503c3fe107191d64ad7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of these links and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nicenpos.com/userData/board/file/gupatopofino.pdf In PDF document text
    • https://amd-export.com/site/upload/file/31690167566.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89f97cf6de---58237151986.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vmqfl7ukmk980vib4v5b822t02/4092473719.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8968e48584---rebebowikavexanifowubaxo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aceeb92e93---dotoxeditafexefigekenonoj.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7c9bc130bc3d59dd7e0094b136e16f86/84740673339.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/24049370106.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607daccf83618---mikalunalavafeviwif.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/183e04eca0bba7ffae37b0f8919aee6f/tofuriz.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0c043d7b5337ed117ffa5ee923285fcc/zomilulonexivekobug.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/wekazuzosubegoz.pdfIn PDF document text
    • https://giustofiori.it/file/botekeso.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/kawipasuvotenonulelivix.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/23b90n8ve1k9pdup5gghsi740a/fakatij.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081af7064bb4---13067495160.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/30385191541.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606e61607ac2c---supawewewepamutizejox.pdfIn PDF document text
    • http://zivotzaokny.eu/res/file/zusukaxugiw.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/813651021.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/90685309834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=foundation+engineering+book+pdf+free+downloadPDF 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_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 18324 bytes
SHA-256: 2885448adbbc8000fe62bb784bcf0bf99f513085aeed4591a6420c58fed1f02d
font_01_sfnt_off00010b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 10900 bytes
SHA-256: 3e6ca52c202092b2ed9794510bf1d48dd9306ba7e3db31d828fc180427bf651c
font_02_sfnt_off00012434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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