Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6ec5a7a9b1c059…

MALICIOUS

PDF

91.1 KB Created: 2021-06-30 05:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 323cd9917832253ad6b6d27d38635917 SHA-1: b9959a08084aa0643d8b5c71bfe09bda1390529d SHA-256: de6ec5a7a9b1c05957920db47f74fce133dd08ae9da5a1f5bdbb3cb9dcbb3599
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating malicious intent, including a ML classifier flagging it as malicious and ClamAV detecting it as a phishing trojan. The document also instructs the user to disable security software and provides password instructions for an archive, suggesting a lure to download a payload. While no scripts were directly extracted, the presence of embedded URLs and the overall context point towards a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://skikk.eu/app/webroot/files/userfiles/files/wivakidufukir.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/58528829254.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/37299973176.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/79945590036.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/zonezuxaseruxiwojeluxa.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/vogewu.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/pufalisugukamegolijifi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13058b1596---63117655170.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607179db4a71c---tuzawepefuzidodesekibeto.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/xetum.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/lrh730qqhkl35r4qurv891p44b/7595525939.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/cd47df66f62de53414ecf60968e885ee/79513624904.pdfIn PDF document text
    • https://blogsma.com/files/90755232171.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/wanowedakeguzujotol.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1bd68605b---19151700380.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/71888291869.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kuvudigufazesuruwuleve.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/95122571134.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3a45cfad6---79298207878.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fa425463ec1c2049f44847b929d0bdc/72010647555.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e78f689e703e9d5c6a5b027354b3a94e/65795794381.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/xowezedasixap.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505075712662453.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/69685262369.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f1a7d33a4067bf55f4bdd6c7f412400f/35192808273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=kmsauto+activation+for+office+2016PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 17012 bytes
SHA-256: af7eb3303f8054e1af864df13d6e584f2f695309c1ebe066ac4665ad189fb245
font_01_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 11072 bytes
SHA-256: 4bd1252ae2da206f62d854703529e0de92e1db84899fb2ce7517a477d0a6501a
font_02_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000146fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FA 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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