Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9dea940dc33749…

MALICIOUS

PDF

88.8 KB Created: 2021-08-07 22:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 104cb0f0701554c4b7e4ea1779210b2e SHA-1: bdf6d07186ff22fe9b2ede8007866e634bc4c9f3 SHA-256: be9dea940dc33749bcfc1d8c4e8623849a924ea647707c0e6cf9b75ea4c4bf78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised CMS upload locations and disposable hosting. While no executable scripts were extracted, the presence of numerous external URLs, including one hosted on a compromised WordPress upload directory, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3e7d1ff614588acb936ec0c42eebc8be/taguzovezux.pdf In PDF document text
    • http://masonlegacy.org/clients/61515/File/59331804097.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/69db959735471df033d0005a9d5cf095/36771695024.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/32451574687.pdfIn PDF document text
    • http://bakoca.hu/files/file/rowilegixiziwasinovel.pdfIn PDF document text
    • http://araonline.hu/uploads/file/rowefinetokonuxatu.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/nevameperemi.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/22959267276.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c1146210d59---86756331118.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/kufasi.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/gazexuzo.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d9d4060a---jobogatude.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3d06b8c607b785b4006f8f3318cfb239/3397992679.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8fbc92909---naxakefelivim.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8mfg7jiuci68dkj7enleou8ug5/2012910414.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbc486e27---36047360606.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210620090509.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcf1549d03---daparamepil.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/vakekomiv.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/319656736.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a723d13b3---72699941856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nintendo+switch+games+on+amazon+ukPDF 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_off0000f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 17636 bytes
SHA-256: b80ba2f6bde74b69fbe9d4058dd5d3312a0e9cf8f78076875f80658061e07c37
font_01_sfnt_off000124ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D03 10984 bytes
SHA-256: 40005260af06301a7173f7aab7ff23b32ef5e81f84d0281f5a2d98dbaaf3f178

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