Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d8b664d495a3c2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 13:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 152fd6412d9c729c957d7f1f6eaacd50 SHA-1: a190dafb8a1e2453b561896814ed2776d3ded29a SHA-256: 05d8b664d495a3c2c5dbdc5dec0d9aaf84a4224dd871a5162280bad1b49bdb92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised websites hosting PDF files. These links are designed to appear as download sources, likely for deceptive purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79383251d---lusunivukajabexidiwunivep.pdf In PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/dapimiruloranolamid.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/fovuboz.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/poxexawubiwewidubaj.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210915_163432.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/43082732381.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d1450287a81d438d94353c6ea4c60efd/24639410556.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/61728333793.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/99680057865.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613773e55583c---4319890820.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/deduropapogovapegovulevib.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/215303853.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/94936579803.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/33573983950.pdfIn PDF document text
    • http://placc.info/up_image/60992523487.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/talulikawesozigogagoji.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/19256237068.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/12990185126.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210917004702.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/49127592973.pdfIn PDF document text
    • http://vhktn.at/images/content/files/48900391387.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/wenukixusufopufik.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/kudozamikevusiduvaza.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/36658519054.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/48635778418.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16143ebcfecfc0---nesel.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613749cd25a78---negawadoxeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tekken+3+apk+download+35+mb+for+androidPDF 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_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 21232 bytes
SHA-256: 52022a648670beaa5e643157232df90d311d7de19035992995188ae96699312a
font_01_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 10980 bytes
SHA-256: 7b853e01d969c145e527631ee3ff6e9a10821a31d3c15e098afe10012b4b0241
font_02_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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