Malicious PDF — malware analysis report

Static analysis result for SHA-256 726a1bcd561de8dc…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 16:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 354dc15dce05481169fccddf4fc058ff SHA-1: 272d32869c722f5bac58fdb1aa73bd726757a753 SHA-256: 726a1bcd561de8dc974bc4e4afaadc37209e6280b1be7eb9021abf688ea2f002
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/13844150309.pdf
    • https://7mark3t2-7aya.com/contents/files/98949179516.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/tqulu9ggdgmjppufh4vbno7928/dodanakex.pdf
    • http://zkqzl.com/uploadfile/file///2021090410215285.pdf
    • https://pensiuneaselina.ro/userfiles/file/forisujesawakivej.pdf
    • http://thedewakohchang.com/image/upload/File/imonopuroxor.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a019713cc---18048501032.pdf
    • https://szabolcsipeter.com/userfiles/file/xikaxoxelakunam.pdf
    • https://nenanhduong.vn/Upload/files/tumixe.pdf
    • http://xzass.org/ckfinder/userfiles/files/88148647601.pdf
    • http://itcbeautytrainingschool.com/userfiles/file/3867735259.pdf
    • http://nagakuratrading.com/js/upload/files/64141823175.pdf
    • http://davidhammerstein.org/userfiles/file/11949836237.pdf
    • http://form4concrete.ru/pics/cont/file/98358442115.pdf
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/57282781116.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d3cf2cd7d69811e53739bb77ce329c64/tukebilezefetujemafipe.pdf
    • https://galaxytraining.examinationonline.com/files/wixunuv.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161404ab1ac349---34175621752.pdf
    • http://marasintl.com/public/ckfinderuploads/files/vinesonosewodiferiwikixo.pdf
    • https://speak82.com/_UploadFile/Images/file/60905837852.pdf
    • https://sibois.eu/userfiles/file/6796207461.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614598f88c70e---77129207903.pdf
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/zifiju.pdf
    • http://unseretochter.com/images/file/tofevifafepinoforol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hello+neighbor+ark+android
    • 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_off0000d679.bin
ff7dec17b9dbe15713c7991f8291062a761d5d813673a997275a2f9c2ad03592
pdf-font-stream PDF embedded font (sfnt) at offset 0xD679 18320 bytes
font_01_sfnt_off0001066f.bin
acc286010c199eba6ccb2257318c78e0bebba3641a3a678ed5717422422f33c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 10484 bytes
font_02_sfnt_off00011dd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 16792 bytes