Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae10a251e55500c…

MALICIOUS

PDF

85.9 KB Created: 2021-08-12 16:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fec21d62159d64b5118ee9f7f67023a0 SHA-1: 5d688320aa94dc3f900f7299b60be7cf67cf7370 SHA-256: 7ae10a251e55500c532bcd4ef550af6eed4aed2dada2dd19c59e35acb27195f7
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file utilizes a link farm hosted on compromised CMS uploads and disposable domains, likely to trick users into downloading a malicious payload. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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 https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9cc33d8a76fdd8afa4ffec4cdb0efc5e/1737272769.pdf In PDF document text
    • https://zoorichi.com/temp/fckeditor/file/1035589928.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/nozowunidoxadaziwalilazo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/be04c43300e103494fcbbda24066f513/xefekedijijebejipir.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2r32q2lsinjlrin4lfhkl33joi/fitojazudobesilo.pdfIn PDF document text
    • http://amdind.com/userfiles/file/38213427486.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/wogikesap.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/91212413797.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832dd9848f---tipevifubote.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/pupiporifedizigidij.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/31844657162.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76fc6ea64---35774434600.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd90d0a78a---17910579610.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/nanogirewodimovu.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/m3fpdi2ne31rlkr154lmfpg546/72786777848.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607748b424319---tefodiwo.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/83907769074.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60ea18ffe---99970583668.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/fipaditijulaw.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sutotijamodawuz.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0q8gjmc0erjadj3s14sqfuuk15/kevutukogosi.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/punidibit.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/18139973701.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/sazanosejolonoxakera.pdfIn PDF document text
    • http://myredm.ru/uploads/file/27994673702.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/2612088388.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/xiwavutel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=free+printable+coloring+math+worksheets+for+kindergartenPDF 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_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 11364 bytes
SHA-256: 1d540e05b7155027885eeb96bdcc4de80d68f9db8a58e42141882aa250ee0cae
font_02_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 17900 bytes
SHA-256: c6cf919e5206e715761031dca55e4a360533178e7b79c7a81393c2100da3ac23

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