Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b2aa7af64105cb…

MALICIOUS

PDF

96.2 KB Created: 2021-07-22 09:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 178c8bb16720f72b82f6ee19985307fb SHA-1: 6d0592f5dd5c104c3d137282919cfa12ae9dcc63 SHA-256: a6b2aa7af64105cbc3fbdecee877472f5c5c12482e7f8b783ce1477e04a4e543
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it is part of a link farm intended to redirect users to malicious content. The presence of external URIs and the overall structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1eb0bc353---47022808062.pdf In PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0622/225486174f4db4bb9ec4c92e20df21a9.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/vuzuvakuzi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a8d6d0bc---wiboxo.pdfIn PDF document text
    • http://bronia.org/userfiles/file/gaginetedevupi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b90ec0b3---zipurefilanut.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7a4727ced0beb519c52c74f6f57d216a/fujeriz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79c8e8b2c8---vorupov.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0028845e14---sukezuwadoj.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/81669d987a790fa269c7714b61a334d8/befetisanumon.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/rlmkl3cqh8rq6ovqoklgid506r/mowokirupula.pdfIn PDF document text
    • http://wenxuezj.com/images/File/95663108208.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///xufasilamuxemikiraba.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/risipovirenamuleraga.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b2aac573949---54217476417.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17b027240---xotuvotigiwev.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609191fb39c01---kilulewakisekofod.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/eh2od0dog7r3jk28h51n6r76lo/xejaxisepavi.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210512103035_1227884468.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/sawunotil.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/sawezigefuvuw.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/12756218052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+indecent+proposalPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/najalizinuxewokutetokadi.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_off0001113c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113C 18608 bytes
SHA-256: 221f944e06207fc768bb652807e4d437704f9f8090cb521686cecd11c4909f05
font_01_sfnt_off00014202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A19 10788 bytes
SHA-256: 62f6befcfef8062dac777a234df57ffe9ebc63cc92a9ddd128ad0bded9263afb

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