Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e683b5b917e0fcf…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 01:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 030a87ad61835f253c3a3aedafc3ee94 SHA-1: 1851ae778878fc8cc04111d53d31189ab3e9a73a SHA-256: 7e683b5b917e0fcfbf5205957435fa7b29014d8755c528f250a8b2cb0f2c044c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of external URI heuristics and the classification as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=banwell+mccash+spectroscopy+pdf PDF link annotation
    • http://sqx.cc/upImgFile/file/20210513175529.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f3c073bf6f0024d6b07952a6ccefa650/noxuturinazuropekan.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zubalaxulitalogaxasog.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d72bf704aec---79270504055.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e32562f74---16036360614.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/23694566843.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/sizilesifupusubeget.pdfIn PDF document text
    • http://dentali.cz/files/files/xatozofenux.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/9oqb3d8cj0nm1afbk8va30oqlc/12040001961.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/96715587718.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607247d5db002---22324069728.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68d6d3cc3---gavubeximoki.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210827155349.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/jovakonafutufo.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/mogajepedejitarokorivam.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075958b9afe1---wosekebezerow.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/vovajibateme.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/tamefunobil.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mamawon.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/075e2fb2055ea52d2a62e0f62bbefb97/rijepowukeguzijas.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210723082601.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/64ef4aa359abb6463b25e6bff632c74f/3836635646.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f900b89f39---bokelik.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/nuxinesuribejutiwejobe.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/64e27830e628ccca0c97070340f94f99/8201160338.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_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 11044 bytes
SHA-256: 6400f97cc63f6d8cf7c119d6fa4f70d2c8e96a02d540af03b96ffac0aff12ab0
font_02_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 20712 bytes
SHA-256: 1fd5fd171279b4b064c11b3350eca5b6873b1fd938b99991f5d5cf1ad9810366

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