Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61d287d18351bf9…

MALICIOUS

PDF

94.6 KB Created: 2021-08-10 15:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 063226af1d637d5d2057c890cb8f0674 SHA-1: af2dd1822a5fa32534d2e0ce8545b98400b70d80 SHA-256: d61d287d18351bf92cd9ecbc60a435f7b2a57835d08c4d7b9c14dade2a754ac4
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of UTM parameters in one URL suggests an attempt at tracking or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4272e5d750---82392402661.pdf In PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/95239815153.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6e8fb55d79dee0b9c9e7dc7f9ca24733/bufujizepibevaxenokupiw.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f01fd04dc07---75681070710.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/95845304524.pdfIn PDF document text
    • http://krupongs.com//images/file/xuzedon.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071240579a99---gifilumurovuruzojik.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/tifokupaneteronef.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16104482d45035---17129153964.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5a3b1f1f---50723082487.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/18ffee6b188beb71cd164a274ca79459/36351156451.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/acba40b61743beff1a8e390c8434c9e1/63352605278.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/58555850280.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/sovodipiw.pdfIn PDF document text
    • http://babamoleskine.com/files/file/minizu.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/niwuguwix.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/17525186623.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/gevipuveputonatifogolol.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/xikez.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/sizunawojisubogure.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d82312d77c89904ab9cc8185ebd12fe2/99717043626.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5e99edcf328737ba4e0eb2000afa8a36/fexaxog.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0289a83e5---38088259694.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/vewujunup.pdfIn PDF document text
    • http://robedecreateur.com/img/files/kenizi.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/6128149231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=descargar+super+smash+bros+ultimate+para+pc+dolphinPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 11204 bytes
SHA-256: ce62a34bd67ac0766e3a098acf5b2f36025b264d96ea300ef4cda43bd1694b45
font_02_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 16448 bytes
SHA-256: 25b9c34b44ea6f8dffb183aedeeba05c5cf292536b51eb25ccbdb9c4140b58a6
font_03_sfnt_off000139e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E7 19088 bytes
SHA-256: 3429bbbc971220772ba951c36611bf1367157b9a7dfe8869a9074adba24d277d

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