Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee0896ed286f589c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 09:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89eff007c8bc6f8f87c2887c0bdf4859 SHA-1: 64aa118d4c3fdf09d671c535508c5b8f72a90b2f SHA-256: ee0896ed286f589cc55656dd728c452ae0dcd325e11e72917d0e87cf3ceb84ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=iperf+commands+pdf PDF link annotation
    • http://imreelectric.sk/uploads/file/favorazos.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/mebesolifirupina.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/31125366180.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f0240d7b2---valixis.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/15201996812.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a6a4e2301---24548164148.pdfIn PDF document text
    • https://bio86.net/fichiers/90421042302.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/48400307931.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28aebed9d5---57522921706.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fd332b3cd86---dufigoxemojupini.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c970e2db2d98333c3ec0a7f6e6ad159d/19465817756.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071a369081b4---54637552262.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/sevidetezofago.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/beziwiledegoxevabumolato.pdfIn PDF document text
    • https://bursac.net/userfiles/file/81658548631.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jatokubone.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f97d0497e60---27934250538.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/bda35e44d6836fcfff8e9638e6dc5910/gidagigavavo.pdfIn PDF document text
    • http://llux.vn/uploads/files/gozosemudadufukagumekat.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60f3e61c7f---fomenavopupa.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/gupisilawefusasixexepise.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/sugodukikikadatexuwu.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/40903707390.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/setanetosetiroxosud.pdfIn PDF document text
    • 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_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 18184 bytes
SHA-256: bb4b1c297d0d69e246164ae79fbac20b22282baa761473f8b39941087959b5b7
font_01_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 10496 bytes
SHA-256: 806b434409f11a163f54af45d798a69d6baf254859846689994a0c92460dfcad
font_02_sfnt_off00012cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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