Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb4231de05a0d83…

MALICIOUS

PDF

95.6 KB Created: 2021-09-03 00:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cee97467910a3b7dea62130c8cf29680 SHA-1: 0b61f40b9e4c12737dfb94fa10c422b31f49b9e2 SHA-256: feb4231de05a0d83cc8eeae1b865bc5a2d1e7c4d5e8bec520c4373567ba89792
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malware or phish for credentials. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fusiongrup.ro/userfiles/file/pefifugodefopodoz.pdf In PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/dfnj2eee6ur189k3mfb1e70kth/45270511523.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/15688341285.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/3vt74f49k6075nj500p53l4isa/84890595797.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/01hqmqqqjcp6iqaaifh3pvqoq4/sumebotozidulumalavizo.pdfIn PDF document text
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/22128160449.pdfIn PDF document text
    • http://zuche0551.com/upload/file/bizodinajute.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/dupodopofewixajuxakobet.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f182ce6afc5cc297bc4b5b0456c95f3c/fagumemuvexorogebelo.pdfIn PDF document text
    • http://dgjst.com/upfile/file/46733428430.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/70888534170.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/72216058322.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/734617229711620590896.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a44987337e8---kipoxobiri.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/52970518221.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/41311099090.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/kerigubokoturov.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161290915d4565---keretiwu.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/zanunijegasopus.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e293f221d---jolivepedaf.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/11702974288.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/wezakifiv.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/dulazuminedimiridajurunek.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/acf4ca27ccc6045564ef743ecb8fc767/wufilojepakonovunipabaret.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/6aus3l3kkf8omtfggcqgdla62c/davelujifupume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+blindness+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_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 10348 bytes
SHA-256: 6986a8bb6e99daca6203365e68c2c68f1595df80bf820d642285e6aae7c594c6
font_01_sfnt_off00012819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001402b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402B 18768 bytes
SHA-256: 6c672780e512ec90dccddb4163553405d24588dedd1c4398d4272ce4c8c5b925