Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51534aeb603e97e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 22:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2aae3c86da0e30d8b107e603b7b9af8c SHA-1: 1383e2cae1610a9348780904a6c2c8e80c31d5f1 SHA-256: d51534aeb603e97eed69c5144521f5bda99a79c9741b68c539f87e3a0367cfec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised or disposable domains, suggesting it's used to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aristosaigonhotel.vn/uploads/files/47475757272.pdf In PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/20869765951.pdfIn PDF document text
    • http://msiutilities.biz/documents/wuxek.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/8131557164.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/nadujafofezowakija.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/76416107789.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/60310304774.pdfIn PDF document text
    • http://insei.eu/userfiles/files/vafagirob.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/varapufatefenupibawu.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/wifeminikutesenet.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/bivejamedizolutexatugif.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/tupitesujedakam.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/zimudejolidusanawal.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-9/20210909151517265318.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/71911316323.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/duxelude.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135668434189---75519171755.pdfIn PDF document text
    • https://eclearusa.com/images/file/94836077313.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/69180456183.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ce06f6bef19d23e293d93a3b28f0f654/volufolozanunasavete.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3bc74eac13cde13cf83cd7cdeae1dc5e/73114844879.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5c4e7d27ff3cd0bc4887250dff80f3ab/vunizusewelusinajufipi.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/94355527214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=past+simple+and+past+continuous+explanation+pdfPDF 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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 17344 bytes
SHA-256: 8dbff9956b953ff485116e8bf3a7aa2922ba694ca591c39635f26a4c37da37b0
font_01_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 10884 bytes
SHA-256: 3a8cbb6401fdf12fbfc2f04a7b4cca4f48205558336c3e2f8185607f0d1f6618
font_02_sfnt_off000129ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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