Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb98bf1fb9f6893b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 19:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7bf26648721ffe4443701205d937be5f SHA-1: a7d495eaecd8a93cd7724d366383616d490d081a SHA-256: fb98bf1fb9f6893b2b3dd4523cf91940c6d7a71de31d051ce3e4d75fc6296683
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e676f01c2dd---rizivuziti.pdf In PDF document text
    • http://www.tamtrebinhminh.com/public/files/soxututusosuwexiwibesofi.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/tekotinonul.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/6879364010.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/v3m3s65chkvrglc6omdd1uu81c/jabevuwemazagoweviwiren.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4110f367---3895887948.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/06e6c8624cbd43b862946fea055dcfd1/61906447255.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fadae47380---numonosegonaxuw.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/tolizixaziwivu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a411d29ded6---90288789244.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/xasaguvivosaruxabipudabom.pdfIn PDF document text
    • http://chromatographvials.com/d/files/52224429023.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/1de802661fb66d164e8825387339c8d2/kopukoxopopibimik.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/8031506206.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/10413216675.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/40272567789.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9539a33b5439a178feffd317d968ab6a/46338870632.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/p333chdmm845n0fgmrq457cmn8/buxabus.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/896235de6e512a792232f90c3e90a9ca/96536233263.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/zomanurepafunutubota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=geotechnical+investigation+and+improvement+of+ground+conditions+pdfPDF 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_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 17104 bytes
SHA-256: 7d438ae003417e7d5b4651b7673aecaa9dd3c29c08be1e9e2d5a3ff2c073840d
font_01_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 11272 bytes
SHA-256: ac9e5e0084b40fd21faec0934587eaab3ac280bf44e67ce2c9dd292d7dd9f024
font_02_sfnt_off00012065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1