Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5647f90399c709e…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 05:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54be66b2e5408ee4ffcbd54a9cbc362a SHA-1: 76ac05e74df196208b03eb47ab153ab8c8824bf2 SHA-256: f5647f90399c709e25ba01a8f23e12cb153d87c889355cc2679f6d3a7df899fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or link farms hosted on disposable domains. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://archism.ru/uplcv?utm_term=what+are+the+roots+of+a+quadratic+function PDF link annotation
    • https://sluganarodu.org/userfiles/files/92240725275.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/zagapurobepamulizix.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/xexudexabitolusewe.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/94302756975.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea5fbe5e9a---jipoxunujipekavutaravi.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tikokirozesegon.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/mmcfqquij18biu1jkc8nrlmk12/333260903.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/woduvoximiwabagon.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f30fdca63f70eecc59eb4bf156d1d0df/vigowufiberir.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/xedakaxori.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/13770446963.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/mvbm3r2iojs8ad5uvdgg3a4rte/fenubipewi.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/ravepudofugiz.pdfIn PDF document text
    • http://greenbrier101.com/userimages/vatojorazajemafosijilaw.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b478a20b10---6590980992.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/62443261790.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f426eb9cef3b984723af6eb723da808a/furugazopizoguj.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/82932268093.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/65082407778.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd939d1210---zurasizixupu.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-20/20210620110352221008.pdfIn PDF document text
    • 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_off0000c5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AE 10764 bytes
SHA-256: b268233487daad29613afc94ad415e8dcf8b2a4d5d45eedf22cf413fa8e86a0c
font_01_sfnt_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 17272 bytes
SHA-256: a3e6b9325576d11fe205750043a1bef6aee405dfb2ff5c424b657d5377467762
font_02_sfnt_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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