Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59558a057863e1a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 02:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c85e8fb7f7192ec3eac4c3adad588908 SHA-1: 01ea0aa7deaec69794d2c212ab58380428d3ae62 SHA-256: b59558a057863e1a5d91e1afde32298e440d986f09875b948bc22235b5840599
196 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous URLs, many of which are hosted on compromised WordPress sites, suggesting a link farm or distribution point for malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions and a password to decrypt a subsequent payload, a common tactic to evade initial gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=wpa2+cracker+apk PDF link annotation
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/3656edf2843b995e8e5a78154572e7f1/rurodibawadezebekulufudu.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/57749772942.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/nipisevebepevimuloxa.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/pemaxovaxosubakewetinubur.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/62291825313.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/bevagorexenedelibowu.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/79871735952.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109071454373958.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/gewozelupiruzerosa.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/vegejukamup.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/62760018419.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/dakurawibux.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/26163022645.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79f167e61---28052409996.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/17592476291.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde727e8dd---95409008536.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/raxana.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/zagudoziwanewofosawabaz.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tikekisexolutopi.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/44661497249.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210913223647.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613af73017227---wapezu.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_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 9944 bytes
SHA-256: 01b9148b77128a397590dfeab2e532eac4d04e9f938662397e6684521d6594e8
font_01_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 18544 bytes
SHA-256: 8d6b1568efee7e95d286c19371409569c02ea7c6a2ea275cdd80baa88ec2b66b

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