Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2e9851a1a94acd…

MALICIOUS

PDF

103.3 KB Created: 2021-08-15 14:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 43a4c0d1dae93360394697457a558767 SHA-1: 515debf8ba6e591af1276ffb4ea458deed5fedb5 SHA-256: 2e2e9851a1a94acd3c88f5a0f5c8be72c88fb36b75e6ec19fadc99f0e3159673
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9707

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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/lv4dkps0url9haucminqra7u1q/zalelamelaruvo.pdf In PDF document text
    • http://castudio.eu/userfiles/files/mudolonebu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e25712eb664---xinegimanutulojen.pdfIn PDF document text
    • http://medrea.ru/upload/files/18480420700.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b30a9cd58c---godojivorupavonawobesuv.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/dojuzomuvow.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/kavaposuna.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/57623359013.pdfIn PDF document text
    • http://ailizia.com/userfiles/dobamide.pdfIn PDF document text
    • https://questyme.com/userfiles/file/pasobugabikafo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c8206a785---gigafenabibi.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/nazodatakopedinonofoxezed.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3221e6e1---80770730955.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc84a274c---libuna.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/57554678051.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a11eefb0c08---welulirof.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/52737809881.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/nobomalubigopebixan.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7e5fda429---xanegeza.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/fosoxopipinasot.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/51ok393cjsp7mv7mb0t4lpndpe/81625249997.pdfIn PDF document text
    • http://airfa.it/userfiles/file/vekajajuxoragotolefidaza.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/gesame.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807ad2bc5f4---13874635916.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/89275c679ea1eb5e4a0ad66d0da90636/9900381483.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955f70343---59245869723.pdfIn PDF document text
    • http://special-pharma.com/upload/files/tojeparotumesezipowuzifon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cuales+son+las+7+cualidades+f%C3%ADsicas+del+ser+humanoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016f73.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16F73 18060 bytes
SHA-256: 0e9808ce7c21ce348e44ffc15b5bdf4622058703662b51fb0b3cb037d420833c
font_00_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 10884 bytes
SHA-256: 9b6c39789880f0d3556889f423d8d8434537a5355f37cc95e4a170b7472d971a
font_01_sfnt_off00012710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F22 18940 bytes
SHA-256: 0fdfa9f75d68eb197648fa3dbaf2c884851417f58d0bf718a12692ef9a1f9827

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