Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cd894b5fc91f4b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 08:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 411b7c3e107df33ede2fd1d00b88654a SHA-1: 77dbf383cb33aa597265b3b192290495a170a4a1 SHA-256: 86cd894b5fc91f4be6f4f786fe29bd01395cdbe74fa4c9a59886c5059d3a0201
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=on+screen+pointer+pro+apk PDF link annotation
    • https://osakadentalcare.com/contents/files/52573876384.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/siwalezevibemabagibif.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/saregilakorirugi.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/seweveledexelorel.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/wurogonawijibunajekuzuper.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202109177168_501521447.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/26980049457.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/55719023706.pdfIn PDF document text
    • http://candientushinko.com/images/file/fatujozokopab.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/64748364619.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/majapebulenotepebuxanav.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1532a6a0---20828968789.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/nulemero.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c05868fd8---tajenogowizegif.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/19714077130.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/karamopuzijuvapisi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3ee84cfd---beviwamawobepumanozok.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/97768320675.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2f40cfcd---vixukodesebolapegerijamo.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/94438228119.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/padegoxijagusoguxetu.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/35527879560.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/xizimuvujuvebitosogo.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_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 19312 bytes
SHA-256: 2f88da2fb6e0e99fff5ad407b2d41bfa57a8727aab9743dbc5a8f9f490b76515
font_02_sfnt_off00011d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 10440 bytes
SHA-256: e15ff06047a6ed5b259cc77362d203bf325fbed2ef8af2d79287977002218a2f

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