Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c9c3896f0d26bd…

MALICIOUS

PDF

113.7 KB Created: 2021-07-25 23:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: df210cf65126c7045f1679cab473e5dd SHA-1: b6ec6381ff6e8d7bb6486f910df7e08d711c6879 SHA-256: d4c9c3896f0d26bdb699dfe022d842ef46d2cad6bb2454c044585c583d81a3b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609910c851a8c---44768911423.pdf In PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/g2pmrmth4dpn82kcm8ti4es5q8/tetawinibifibuwinidavuv.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/60011655178.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41f8a21def---lenupadasegawopefovese.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/guladusisobiwunukovovum.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/12783974718.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/72438983409.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/sosires.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9abc7feebc2f7764dca0280167a42e54/10713220583.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/xojosid.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607523c0f3c5f---negatizurumokujepisofowa.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/98b172973643e1465e479d76d348e08f/60966615970.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dadc61ea4a---80046891024.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/wujijaxokebopajelogug.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/32037035046.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/nqoon8keimbp6n8ofuc7mcc654/simijegababerenerotuzenop.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/qrs8jtm9nit7vvrqu0o9jc04bt/raxapamuwutobupudavuxaz.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c105f3ae25661be3eb83ac0aa2650eba/litufapovagezukitev.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/wofomipivokerigomopefebis.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/strqvi3ub6hi2t7snce4f9b6lu/pamajuwepusavuxaxejelim.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hqducdpdisd821av55c1uncics/giwemopumexabexezige.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/zudajafigezawapelip.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6732f90bd9---guvadawazavupokegumezen.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/pabowogawisa.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hne2qdh2qto2krr4l3qq69tun4/sinamo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160badcdf6fd96---wugajapudararisagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=types+of+quantitative+research+instruments+pptPDF 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_off00015474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15474 11088 bytes
SHA-256: ee9c2d8a69347611ade72880b5df2158338c3c493f1468a4c135cfc334c59bce
font_01_sfnt_off00016e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E37 18248 bytes
SHA-256: b8ea88658d1b8a3fcd7393b4dc5698e434a50739bb74472ec2eff60d64065a0b
font_02_sfnt_off00019e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1