Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9959110c70684d…

MALICIOUS

PDF

87.6 KB Created: 2021-07-31 21:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22e79a963e3648a5487e464f2dcaafee SHA-1: 14e859f27b4060440a13213f591574544dcc18a0 SHA-256: 8f9959110c70684d68c474da00f9d8f02d2c3b40af752298d8d1fddc61187aea
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories. These links likely serve as lures to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9bdab8d19---sirodiv.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1881f776f7---nudeliwunonenolopavu.pdf
    • http://cautrucpalang.vn/webroot/img/files/guwutuma.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/g0k44igihbqitbifkpj5gp1ic0/xaxotab.pdf
    • https://brs.jo/userfiles/files/39032846584.pdf
    • https://laflammerouge.ch/userfiles/files/32488514289.pdf
    • http://edu-family72.ru/content/images/uploads/file/86791649635.pdf
    • http://clubsahdianagalati.ro/upload/editor/file/valivipom.pdf
    • http://anhuicrew.com/upload_fck/file/2021-7-22/20210722070502482631.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/73022072263.pdf
    • https://allcreaturesinc.com/files/files/68893415244.pdf
    • http://hugslock.com/app/webroot/img/files/kagipimozakopare.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/poleliberetodunesipeg.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160985bf523eb8---gazenemipofeposeku.pdf
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/mutetupexokawekus.pdf
    • http://harasim.cz/uploaded/files/xipoja.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/kovigivatak.pdf
    • http://senseoftourism.dk/userfiles/file/29081926712.pdf
    • http://inciboya.com/resimler/site/files/97385542872.pdf
    • http://ibb-online.ru/f/file/95001049270.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a932dd3faf8---bepiwigolusu.pdf
    • http://autovoda.ru/upload/files/bugurujosir.pdf
    • http://irths.com/upload_files/files/kagetawugikutilib.pdf
    • https://kindeeyudee.com/ck_files/files/33061970811.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/16808279334.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+recapitulation+theory
    • 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_off0000edc5.bin
7d26f51f7aa80cb4efc773c929d0b9487edd429cb125d2b6f0e9c0ec2f465723
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 18704 bytes
font_01_sfnt_off00011ec0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 16792 bytes
font_02_sfnt_off000136d7.bin
6fb03421ff6bfa49b0c9a8d5655f6ed643ed740e5d90fab0d085dc3d4afb12be
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 10676 bytes