Malicious PDF — malware analysis report

Static analysis result for SHA-256 c594d5081f3c64f3…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 09:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 04e19684188708dc10d02feb0e59a206 SHA-1: fc3fa8b19990a161bfaac79fae2f72b41ca0dc52 SHA-256: c594d5081f3c64f3cae9096bc1c5ae06e4a7915d8b72eb4e6f29279c5f722d04
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://queure.ru/uplcv?utm_term=kolamavu+kokila+full+movie+watch+online+free+123movies PDF link annotation
    • http://educaholistica.com/resources/img/imagesck/files/56091907473.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/bemapiwetirarixakoput.pdfIn PDF document text
    • http://01host.ru/userfiles/files/fajowivekobomizu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/afavjp27nkr25uc4c39s3hchr5/74568869038.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/bidusurikatixujasu.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/dijetavid.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/xikagobibotinid.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/bizumelevobunadiw.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/kizisemumutalutajitudekil.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/36920995834.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/ridaganigoxatepubogolu.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/90832691064.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/94660864092.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/12673978927.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/wesekuwow.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/49456063969.pdfIn PDF document text
    • https://cargotavio.ru/files/file/jagozilu.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18051650670.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/18264012286.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/87839348873.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c38371e46484baf25466b5ccfd0521eb/4439166107.pdfIn PDF document text
    • https://suncables.co/images/file/jumabifawabilelonoga.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c11e4e699---38186756425.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/nurugufosufekogakeni.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_off0000af50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF50 11280 bytes
SHA-256: 62c81bb1c2973c5da1b11ea3b4ca0ee3771230c21f1f28f2d8aca34e85b99f16
font_01_sfnt_off0000c9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 15092 bytes
SHA-256: b18adb902ef7020bd0d1028bdb40d39c126d63cb574c490cd5eb42c9b8f05bc9