Malicious PDF — malware analysis report

Static analysis result for SHA-256 785b6f864d00af82…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 06:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f559db528bacd58f6da172a6363e74bc SHA-1: eab1c617410aed1985495c88a6edf2681112cd07 SHA-256: 785b6f864d00af82e84019ebb1bc8f757403cfb3e26b978e1574b931b79570ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous potentially compromised websites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to obscure malicious destinations through disposable or compromised hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hum-lucknow.org/test/fckeditor/file/64316337486.pdf In PDF document text
    • http://amghanoi.com/images/ckeditor/files/64202944368.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2290bddf---49913074087.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/mijadopez.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e74eac0149aae1e9c57e5fd3d1b62528/79555423933.pdfIn PDF document text
    • https://ms02bet.net/contents//files/39547314700.pdfIn PDF document text
    • http://midospa.com/upload/files/basiwizef.pdfIn PDF document text
    • http://njchemland.com/upload/files/77489318608.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b1a554588---11151747548.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/tumoxoxowazuz.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/29597887394.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8f7fbb4db---vasunuvupulakaviti.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/28549506712.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/dawamefinusu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cc8115430778d4044b9b8c48eaaa79c4/rujulesewimukanejima.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2ea889fa991f3f433b310662520ab19b/73380615883.pdfIn PDF document text
    • http://usmleworkout.com/files/file/nunedagipexux.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/6o52ha8l5glkicqi380bff9tip/pubebelakabevuvobelut.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/fuwumazila.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/nejapiki.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/lapimebokeralutibi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2552bd572ffd74f21de1905bf9935c43/18618873394.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/323d0b2fd5d88faf18beaeaf1b33e716/95056198601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=wil+willis+marriedPDF 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_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 17288 bytes
SHA-256: b1a8dc6ec4196d041c8d2a752c02519619638856253a220225baadec4a72a980
font_01_sfnt_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 10168 bytes
SHA-256: b1339585122809ba538e5651f8fb9736641b13726e6c3a8f878bddb5651c071b
font_02_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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