Malicious PDF — malware analysis report

Static analysis result for SHA-256 daeec8963916e564…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 20:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d1970d1037e3ab4d41f8996f0846b22 SHA-1: 60fec9adb793cfd0de2d2d24bdefe26c8daf793a SHA-256: daeec8963916e56446d103b50d02461007faccee07e26ec82143102874724dad
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://medvor.ru/uplcv?utm_term=escuela+biblica+de+vacaciones+2019+manualidades PDF link annotation
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/43233866520.pdfIn PDF document text
    • http://elitvorota.ru/f/file/28432360740.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/f6209c15c81f81391e305d43397f4059/78311581860.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96005432195.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/ccc6f5735489f1b7811ca29e18ac5524/revopexonewonozoxipixod.pdfIn PDF document text
    • http://aqcons.vn/upload/files/55262522502.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/nividijenado.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/54411824351.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6ecbce238---degomomitolix.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/u6l18muchvgc6ednurs6793hq4/1593340307.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/18570200423.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/9460789279.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee18983ab70---2473494469.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1fd3e158332cd53ade9e2d2403a55d14/kizaxukoleror.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/85042196246.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/vixukuf.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/saxinusexiwajitakejeferos.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/niritapeg.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210719201754_bn67fe.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6gg1pnoo058o64jqvmjqthddr4/80983604992.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/jilawo.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/59058218126.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/giparewap.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e5997a495f64c21ffc75ea1ac9da6522/vajogaxuvukaziruxevi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/21009mbedlhn2andhpr21hi31v/99489601097.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF82 17192 bytes
SHA-256: 736bad5b1f990d62aed4ecf6620ce51020afb900679dca4ee8c145c7c85029fb
font_01_sfnt_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 11084 bytes
SHA-256: cff824406c7665443a3213d62febb58ea1a61f2d54a39191b8760212062ff96c
font_03_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 17580 bytes
SHA-256: 1cd81593c5d730f3d3779b0f2a5ef0f641dbaacc88de1936bb0bd86eaff0818c