Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb7f6aa9dad47d2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 18:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f889673af316934841c56bdaa0df76c SHA-1: 1025a1ff9ff2d6982c788a4a700ce80ba2b216cc SHA-256: 5bb7f6aa9dad47d21dc3c456bdfa2f914b89aaae4e7555777c3a7bd89a2591af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely facilitates redirection to external URLs, which are numerous and varied, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://binhchuachay.info/Images_upload/files/78045525379.pdf In PDF document text
    • http://babyshelter.net/assets/upload/files/52897157569.pdfIn PDF document text
    • http://guitarenko.fr/img/files/pevate.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/jofuwoxefitakin.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xonanafo.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/kosederobel.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/sonobifukijajuwal.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/dakijuvumozebexe.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/61345691641.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e19b462159---somadusejokaruxoduta.pdfIn PDF document text
    • http://mastervin.ru/files/file/lewogujetetetenaloj.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136917484958---1248278169.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/69207993474.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/wibafoxakunukasav.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e8b1d9465f659fa34ec753bbe2384cae/xoniv.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090601194773499.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/kemaberozumo.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210911043527.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/milubasikufilasulefuxi.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/23909206882.pdfIn PDF document text
    • http://agilesolutions.in/uploads/ludopikiwoledegawepan.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/27896949600.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210917095606333602x09m2i.pdfIn PDF document text
    • http://amandamaitland.com/images/file/rikafapemaxirutodagegero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+call+busy+in+androidPDF 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_off0000d2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 11056 bytes
SHA-256: c7e0fcf6c0454e1ddbac1401722c7cf85573050efe45dd455ae2c924ae4d754c
font_02_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 17468 bytes
SHA-256: 8449ec114b54b27f92ad3c8f4f0bd71a60196e0481be97d5a1279ab3bcf59285

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