Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58bfbfaf499da22…

MALICIOUS

PDF

83.5 KB Created: 2021-06-12 21:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4cf26f9c5e63f1c93d2cf132088928a4 SHA-1: 15ac6254d40610d476c86da8f0ea1df03d4dc0d6 SHA-256: b58bfbfaf499da221189b462c3e85b0c5909ff5373042194f85c458945029a1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=download+mp3+in+the+end+mellen+gi PDF link annotation
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/605bedf7550e6a573afa80453b5e1826/kojujum.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/97944825473.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/9867749665.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/bubonozikekegiz.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/23755892201.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b95e765b1a62ea1dcf3a6b94225a9cca/19681904635.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef1b90a30a---93467458883.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160874a0f52972---48653332624.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f58fa9b407---tadiruliguvozofuzinuwujez.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160816825e7e2b---21736903180.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/6135650354.pdfIn PDF document text
    • http://gtshotel.it/images/file/giruxekopupivasobababub.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/nukerob.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1vjf9c5u4kiebaers5lu68ahg4/1575559137.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e035690e75---xozewoxapani.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/wezerofulebudawilol.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/39153167324.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn 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_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 6476 bytes
SHA-256: 94c320145ca2f8416457429c8e3963abd65d7ae1fc422bfef73da4ec62109792
font_01_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 5352 bytes
SHA-256: 164f9bb7a2b1dbf75a2091f3a01fb37fea37ecd9444e1e885072c6d2922d81f6
font_02_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 12716 bytes
SHA-256: 6940b3fd7fe04257fcac156e0eaf234a185f539771cd14d3b08d5aa71fa15ae9
font_03_sfnt_off000129af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AF 16388 bytes
SHA-256: 7c3e126db2a7c917ef2b563b99332ab82b9fa1b7dee6bedf214eaaee74660b93

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