Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acaf897439f3038…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 23:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b187be5dbaeac768b652ba08acdb903 SHA-1: f7771297efd4c8a3c051c4cc8d7f47d39455439d SHA-256: 0acaf897439f3038977b4b02364b08da24e5536de31df2f8bf415a904cc60c1b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to domains that appear to be disposable or compromised, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is part of a phishing or malware distribution scheme. The presence of external URIs and the link farm structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b0aaf3e1---kulugif.pdf In PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/33068539234.pdfIn PDF document text
    • http://brlairport.com/images/file/notixokaratefisatorip.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/49529443111.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/dagelalirarijagu.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/fonevebuxa.pdfIn PDF document text
    • https://value.ae/userfiles/file/76504446961.pdfIn PDF document text
    • https://bczenekar.hu/files/file/gazideze.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/votokafenitupevujexe.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/98b8578f3d2c96a21b75e429ab8eae44/vagituse.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/kepukolajenasesarozuzaj.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/64026594014.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/zexugivifedabinezapo.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/54648471279.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219954762743.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-12-21-57-07-44.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/eomm3lvq3pj094e0cu2dhmmp35/46761463663.pdfIn PDF document text
    • http://446888.top/userfiles/file/ziponogipatatizapebeb.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/sobukeripelofevulidum.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/31888482942.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/wajejosatipetonilidagali.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/edca307c636ebd29a9019a608b603e07/rezabepiwowezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=easy+android+appPDF 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_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 10208 bytes
SHA-256: 8b4d530991a0e5d8a78c249af80138f1016bb26fe1d36a30d5d84eaa7545898e
font_01_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 17672 bytes
SHA-256: 20bafdafb91cda18494a0f2b77abf5cde789628c8af29a2ccd95fd435ccd6558
font_02_sfnt_off000128dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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