Malicious PDF — malware analysis report

Static analysis result for SHA-256 8513c79c22bc810b…

MALICIOUS

PDF

86.7 KB Created: 2021-08-12 10:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a079bd6f7f55ea9bf916fd60e9488f9 SHA-1: 59d8735ef7a865bc4a60ee64c91f6d405e9e8323 SHA-256: 8513c79c22bc810b328bb54cdd10d20207c1706fe2f2c18f748ad2f10061e221
156 Risk Score

Malware Insights

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

This PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=squat+technique+no+weights PDF link annotation
    • https://muacash.com/webroot/img/files/fevuvawofojajomibite.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3841526a63bccc86ba4bba9b77318845/jamowepanojexogodiwik.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e046fe33f440fc187a37322d41f3f4f5/mevoju.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/28608309702.pdfIn PDF document text
    • http://fitviewer.biz/files/file/94620152933.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/51797443153.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/6aa0086f771b810a11f29c5b8caf3dac/wudomaxumazomonubitalot.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/9859310320.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/tivakuzitakanamuro.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8c0599e0---movobamitolipawamugasuz.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/fetobefopiwelajibagenurod.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ab3d1be8---74147284654.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/91494791473.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c633bc1fafb---vusegumujugipajezisob.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef05439aa---bafevarigajewosojizopalox.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/27333911201.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160821d0c1f8d9---rorapejiduva.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608196ceac3d1---rakepozepekufuje.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/027f966a44df91402bd24a85d58f37ea/niwedoj.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/fgn7juqpdr9c9aubc33isijf5c/39627283055.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf01006cb---61530157441.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8hlk3chgk3dl6ia0qcke1np8tb/1843484875.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/92441961978.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/84675025048.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_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 16844 bytes
SHA-256: a658f3c5e5d1356d138820c9480c1fca20c02fcc25a93a95234d3fc6d7e75a6d
font_02_sfnt_off0001337d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337D 10772 bytes
SHA-256: bf1883b2fe96ab9b955ff145871a91a1cb873f978a6265fd55f70990b108b3de

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