Malicious PDF — malware analysis report

Static analysis result for SHA-256 599506c889673abe…

MALICIOUS

PDF

109.9 KB Created: 2021-07-24 19:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 100c7e0aa4265824a856112facec8941 SHA-1: 8808f0317e486c0098e06142e01f0b0c1c68efe5 SHA-256: 599506c889673abe8ac11c9cc2c4cbb50649ff92bd1071440d8aba5b41b435ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs and the link farm structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://drkoopman.nl/cmsimages/file/gajikadukibuwujuruletow.pdf In PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4de6d2f26---58268854865.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/46886936359.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/d563dd7ea0772f0b86f83d579b0976b3/majugutofavopemewadinefi.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/bezuluzoxerojemafonezatit.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/82731239327.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/puwofujevakitujigeja.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/13689798679.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/musomewixugijanosules.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/doxaveneve.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/73637366183.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/48983568220.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/92720866336.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5210f08db---19568070321.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebb7325216---jatofataboxuv.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/70376925027.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/51997556391.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160967e420e89f---misebazuvilupiwex.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/bevupirokosanivefoveburob.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/32226167967.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe33b5423---balijetulekipubo.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/50452367402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+voice+changer+during+call+apkPDF 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_off00014bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFD 16968 bytes
SHA-256: 180a5bc697cd88666aabad95efc1a6458f0b11b26644be07d8637263f5b81414
font_01_sfnt_off0001785f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1785F 10768 bytes
SHA-256: efe9c780fbf507ab80827f84f883c25b75bdf6ee8f60dc7e497c6d1351d4fe22
font_02_sfnt_off000190dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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