Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e8d32d334baf3e…

MALICIOUS

PDF

118.6 KB Created: 2021-07-05 16:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d997df0c521082695e8831099a65aa56 SHA-1: 389df1aeb4b9a08a96fe1ae0149d49ba76806889 SHA-256: 26e8d32d334baf3e06692343097adcb5c92ef07e1de9de13e3cce5f50b465696
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

Heuristics 6

  • 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.
  • 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://musorcentrum.hu/files/article/file/bisutomupopapalafaketo.pdf In PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/fb13ebcee6465b9dbe82465202b9a9f1/nofopovoxaleguv.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/92e696a0702776572c23ddaf60e66666/2958884957.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c220cb77c---70411063009.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/14430024098.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/gunofedubefowekibadaton.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27f8e0a988---20329387221.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/ov86h4md6jcl8qd53es5chd872/gulewodenubomabok.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/wusalimofeladumomilube.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aefc048504---lusad.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/xegekozotixiroz.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72684057969.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e13834bcba---radebusamunu.pdfIn PDF document text
    • https://noddy.nu/images/file/xigewidivomojemagoke.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe8084198---32500120381.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/41360990824.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/98131049719.pdfIn PDF document text
    • https://maclashoes.it/file/43478321152.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58323002e5---fagejefiwusivebodopo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc38806dba---muputexoxajujatu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210616024242_kpznsa.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/tijedibikegifow.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4c1111ffe57dea78899341a36a17d08f/93850382972.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c94090555a---bomanenamejomijipe.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dcb2bcafb---xafevidalesolosa.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/84416917135.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/76895277216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=phrases+beginning+with+nPDF 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_off0001647b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647B 10448 bytes
SHA-256: 3a564f5a91d2dd9425bece74561d12c5ca7883fd6c31206e3115906bb72d2ced
font_01_sfnt_off00017c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C33 22660 bytes
SHA-256: 5abbb1398f3fff40feffadc2831ee6717d197f4731c88e9d991d41e89d1c275f
font_02_sfnt_off0001b503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1