Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5eac9f390c5f99…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 19:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69429e3f34b741e368d26c598f75c4f7 SHA-1: 838a953150dd61e0bd9e5dc7a836c090e6495187 SHA-256: 1e5eac9f390c5f99183b9854a1aa454e5ba0166ded61da57cf3a25a6c9a3a8c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and a link farm pointing to multiple disposable hosting sites, many of which are compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/56cfecce9720634cea4d7b370354fa9e/91618504531.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f034a8862---97800324991.pdf
    • http://islandpointfl.com/userimages/81536480753.pdf
    • http://weiddy.com/uploads/files/202108251444598172.pdf
    • https://dbhattacharjee.com/ckfinder/userfiles/files/30384034606.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb67ab21f4---42725261840.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079adbc9b0a7---bafidubibisazoti.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/givaxifajepixelizijelagon.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084f5f333501---tilenatunifuxere.pdf
    • https://eagle-aviation.com/userfiles/files/xeseboruneguvob.pdf
    • http://shuswapladystriders.ca/userfiles/file/faperesutuwurafuz.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/kireba.pdf
    • http://lukinserv.hu/file/14614180379.pdf
    • http://espwireless.net/uploads/file/lupupodakanitezug.pdf
    • http://wenxuezj.com/images/File/vipoxuv.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076309dbe779---22073130229.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716dcdc34c6---suwel.pdf
    • http://plusk-car.com/js/upload/files/19071753031.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe96206f8---telopolijusalujiwuvaropet.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079f995556b9---33492087615.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d66846fd5b0e9151371cf0231399c49f/rinoponawewunizulelu.pdf
    • https://artasedanasingaraja.com/uploadfck/file/84789974307.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fbab2d8ba57---bafifugarebizejike.pdf
    • https://mgs-on-track.com/uploads/misc/files/28260766516.pdf
    • https://mavibusiness.it/file/94361460097.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd5ca0d33---pufobinixizulizuvif.pdf
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xugivafatib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lycoming+io-360-l2a+parts+manual
    • 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_off0000cc7e.bin
1d73176e2de8d57094d5842eba11e829d0e6acaed5cf93d98e3b916efef8773a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 17680 bytes
font_01_sfnt_off0000fa2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 16792 bytes
font_02_sfnt_off00011241.bin
2cc6a0a071410aaf0d64ca7701c84e55d1ac2c5395d65cafd79dc4c891194a4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 11372 bytes