Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b68be7ccebddb46…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 13:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23d93921a4826fad0c5795f72fe5b52e SHA-1: ebfa0818a38cfea4e26e7526198f31e341a90bda SHA-256: 1b68be7ccebddb46b786201d7e5b4352f229a081b05bdeb0719072e9c0d4a964
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM firings further supports the conclusion that the document's primary purpose is to host a collection of links, likely for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://citranco.com/users/files/navoluvixafetojototita.pdf In PDF document text
    • http://auroraenergyproject.it/userfiles/files/wowajo.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/jifepokunevelaturu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/q9ir2960oj3ds0aih45oa0d1k2/66905723001.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/34727902179.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/96509490140.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/ropofaxolavi.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/jugebebubirajom.pdfIn PDF document text
    • http://dietmoitangoc68.com/upload/files/lokinutozuxopadabivuwopuk.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8c798498---muzadezavaweretaxedudene.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/getofixexusofu.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/tewegexazokuwojiviwunak.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5d2528ecee7149fe217f4d082a1a8da9/pebejomuto.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dujoti.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/lujozafewugutuj.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786a9b7178e---86633427.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/0hfbah5ooc84e04ursdb012pj6/popedinazobaduzipiwuzoxev.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/f510509e3b262aef427ecd2934cefcbf/wosivobigoxuzojuj.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607935a4ce0c7---jewezusikon.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/kekerifu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f1727d2d3d---nisezowovajiru.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/60874353995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=canadian+pm+justinPDF link annotation
    • 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_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 18752 bytes
SHA-256: 13b5f2f808c959dd70a1a986130d7d077791b02d51f7d53b1149167feb0288f6
font_01_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2F 10416 bytes
SHA-256: cb66106d79845042090903df3541fdacdef4ac3f13fa5686367308c47a3fdbb8

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