Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ed7e61d47b41b9…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 10:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6565337a5c078bf13e84b998a0c94336 SHA-1: c40685457ef29d35f2ccf9378d9aae37b43609d9 SHA-256: f6ed7e61d47b41b9392268aa4f7adf26aff7fc97472cfeac9877fb0039e8e4e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure victims to external resources for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=mesalamine+usp+monograph+pdf PDF link annotation
    • http://chapelguild.com/images/usr/wixow.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/80598107369.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/xesapesesofolozu.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/ef94a6e4cbaa361a0dc11b2ea5fc0c35/duderosozipobotunelul.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/38696625212.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965e812f5ce---wedisopoteserupajupaz.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8865652662a32c7a361a6a3c2051e57/sajal.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/kunikip.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161042837eb1ed---5730576521.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/30757661007.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/pidurineve.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f823e0b6c28f79c4476486ddbddc90ae/39054047565.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac1e42f5b---zizemorimitovosajibetema.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/dusidofoxegimoxiwogobiza.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/tololezosumilubulenewilod.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b4259733b---susojet.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/mumelugixobimonulu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16081acb2219f0---87446106825.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/8107927943.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3020cbc11---61628761567.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/gojegulojurazizokuniv.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/57608337974.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/91967166136.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/45852786468.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/jomukuwavijizefega.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/65772035283.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_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 18088 bytes
SHA-256: 8767b7283696c4578b5b54f6d4811c131f81503bb1febffb8f5e777603c4de1f
font_02_sfnt_off000117c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C1 10940 bytes
SHA-256: f494bfd60081cffe76998bacbe324c897c7e03a76d2106314c78284b1d00ec3b

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