Malicious PDF — malware analysis report

Static analysis result for SHA-256 476bd90e72a6f4e0…

MALICIOUS

PDF

105.5 KB Created: 2021-07-14 04:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5fa47c11f2255296a970e16c264dd4cc SHA-1: 939b7541d8c67b50987d25267ae788e52b692479 SHA-256: 476bd90e72a6f4e05f393457e991ca5e40e211923bc43ff556a8066726640974
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, pointing to numerous external URLs, many hosted on compromised CMS platforms. The presence of multiple links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/zaretevamob.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2f3058f0---sazono.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/90473954e9f28faa88e3c79c59debf5c/58025125046.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/68286890592.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6bc0e78ae73412d35a3440f3c02477ae/dosijugomolivetozowevon.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/36633142516f67b71335350462ef5289/paxobuxemilolututi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a47597836---37992010739.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/kilurugelijemusufa.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9169178581.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/19370259951.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/sizofadevixanujuzefeminib.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1e2ef2fe683cae5422f5f494880c6291/27175777346.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/igs3ppjeus6v58esojmh6714rj/dipesujerobavoj.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/rekulasiwufe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62e8698a7a---berigaxodugubabas.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/e3e1666ad0d6a1ee89201ee7ea4797a6/6109474955.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6a8f261d78a6b45eb229fb863f0c06b6/verogotamumekekifoma.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210518074202.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/lebasane.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48ebef9bb---82257540325.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/093c9d7bbe269c3ad9ba7db25a72e338/pimuvewerusa.pdfIn PDF document text
    • https://kopari.hu/files/file/dowigevonuje.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d4441592a547c414bd4e2ec492cb0fd7/bomelupuperumutufotex.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/68dv3mvav7n2ep31v5v4mcus12/41810635444.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d1a7c220e---50211323285.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fd45f2416---ganowusabamotupekitamek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=glucose+reabsorption+in+the+nephronPDF 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_off00013c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5C 16828 bytes
SHA-256: ea9dcbee57ea4c0b251b279bf87cab430ccba88b5071dc908f59106488b6389b
font_01_sfnt_off0001681a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1681A 10748 bytes
SHA-256: c8fcf6d7c279b7d4d46e5c405cb031d70ee47eff5471d8954a3549a889b3f00c
font_02_sfnt_off0001808d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1808D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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