Malicious PDF — malware analysis report

Static analysis result for SHA-256 232f12caa49dae26…

MALICIOUS

PDF

91.4 KB Created: 2021-08-11 11:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3afee0cf6db5f6bdad3b24c655fe499 SHA-1: bd895d533ea66b0c2b0de82309bbb952dbfe53d0 SHA-256: 232f12caa49dae26c7a763094e5ea1012366cab65aa98c7a7968e62cc178e222
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The PDF itself contains obfuscated data rather than readable content, suggesting its primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/e409a63b3f1926dc8b50960a087ce0e1/jevazukafakubaxin.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ti4ati584hdsg7kpjai12292jq/gutupib.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/uos2ulj2mio9uq4gq1d01fbjfb/62434756733.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3ed0f312f---3336981210.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9831dbfb9c---98594956590.pdf
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/jazorowokupodaxi.pdf
    • http://fzsvybbs.at/userfiles/file/91757455283.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/37120383997.pdf
    • https://glbtrader.com/userfiles/file/22203919516.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc9435a5c---17135695172.pdf
    • https://bibliothequeanglaise.org/upload/files/jamaronekalovenobope.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5cbcd6884---46908471067.pdf
    • https://palezieux.com/ckfinder/userfiles/files/14969762382.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b3f9c699b---bemakibun.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/331d2303f7e0372e7450551bc817a01f/45395371821.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/n1qnbho2ha66mf3l1v597clp0j/rojudanolofokavukoxe.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/dedusinuka.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8e57f1a88---1975257371.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210701_4FBE8904B0042385.pdf
    • http://autosoftware.company/autoresponders_images/files/kebafifitef.pdf
    • http://luatsubienhoa.com/upload/ck/files/92738645318.pdf
    • https://forumhrdbekasi.com/webroot/userfiles/files/birosixikowogalipiwav.pdf
    • http://sarlampa.ru/upload_picture/wovileminawutepuzagabipuw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=writing+systems+of+equations+worksheet+answer+key
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb71.bin
5e72ec3f3c05b13c0ad0557c8b8a48b2c7f4cca2903819cc2026af07fe9518c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 11148 bytes
font_01_sfnt_off00011516.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 16792 bytes
font_02_sfnt_off00012d28.bin
dcf9047a29846b19659979f8e38032fe8077224e37c5550d12ee66c935f92791
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 18184 bytes