Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ab9f9dcd7d4a75…

MALICIOUS

PDF

127.5 KB Created: 2021-07-31 12:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 29f9c460b93af9eb8414a8101e3f254d SHA-1: 154e49e707ac3482f70552699198bd7d09347c42 SHA-256: 15ab9f9dcd7d4a75d82ffec4f9c4034ee7bfe5165e722eb4f5ca3a37b3127a54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, some of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to malicious content or phishing pages. The document's structure and URL patterns are consistent with a link farm designed for distributing malware or facilitating phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://oniceh.ru/uplcv?utm_term=tekken+6+size+for+android PDF link annotation
    • http://nordicaluminium.ru/userfiles/file/21153311826.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/28527154316.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/747a77234616997cbf746e2ae9017598/jasiwafekiwolematebawe.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/39782262740.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609459b2ea132---ninevonoxe.pdfIn PDF document text
    • http://yuhongzg.com/d/files/89257088021.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/zesenisawo.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/68484711071.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/mjekg2mvgdtd0e2j10ajk5u4n2/xikigaguzunido.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/r9q7mc9ba259k9eanpkv8hmov4/2656382105.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b601dda29d1---98396014093.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16078e06528167---2552600895.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/wedibi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3b2fe09a7---21317907714.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/37902924561.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ofbqnc6nbffktr406fpj8ldmrc/47930790225.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/vuzipewosanivunom.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/24583072999.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e25a1df2b360f4f75fabf74e53088b39/21234423834.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/17824259436.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/a1561d50f2788f1d1cb6b575a521cf41/sagolufujiwedunejupadixur.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/92524979364.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000168bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168BD 4688 bytes
SHA-256: 85d59bb5bfde578b88cd7921dfdb72ffd348447c0bf7450ae13f6dff6aab2d6f
font_01_sfnt_off00017a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001925b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1925B 17672 bytes
SHA-256: d0113810660e40cba651509cbc8ed16bbcc66b59b22b9c14a5a00c8f45805510
font_03_sfnt_off0001c095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C095 10484 bytes
SHA-256: a9dffc7f4ba7e26158fb079be278901e9a5a2746e74005138b9bf7baf298e3a6
font_04_sfnt_off0001d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8A6 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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