Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32f1545a81f3abe…

MALICIOUS

PDF

75.3 KB Created: 2021-09-14 21:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 29a8ea27987ea54796e3bbdf96e03652 SHA-1: d1c50c93a9bfa45b7a3ce7ff4cf14deb1634185c SHA-256: b32f1545a81f3abe4073a117a6ce89b01d401d75bc82712aaaf9e3abe76e64bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The heuristics indicate the PDF is part of a link farm pointing to compromised WordPress sites, likely to host malicious files or redirect to scam pages. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=bloons+unblocked+no+flash PDF link annotation
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ab89c02fd7---guzojitiruxawunime.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a78c33d44b---nedugumifisosi.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/nivewapapedaliwozubarowa.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/11708629337.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/kefefumep.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/meniridunonebo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4ef506174---77623080235.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/nunafira.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/liwulomavawefotapepad.pdfIn PDF document text
    • https://12tiga.com/contents/files/37558951502.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/73651086178.pdfIn PDF document text
    • http://allier-genealogie.org/File:/21269488954.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/wirujama.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/kugexidum.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/42839801153.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/9841632345.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/74860477098.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/wolirel.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/1006432544.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/29278217706.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161357cac96206---54702076826.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/69f6e2e335da89d8df299fd3819920c6/32104767735.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/bisix.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/76188855211.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/43656524212.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_off0000c3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A7 16908 bytes
SHA-256: 84d92d47ccd20c44eddf98925fd42415d752a292bbda517a14687d0422c07223
font_01_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 10668 bytes
SHA-256: e4cf4c759da782ab8ca2c1dc4cec8149c9521610f6ad1ce183df3bffde757e30
font_02_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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