Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1837bfeb05f1537…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 10:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 620502c8b85493d9f65ca8dbebb1fd26 SHA-1: 3a2027e0e3efc3645723702b96ca1762689c5c62 SHA-256: f1837bfeb05f15371ef949310092ceea774f3b2b230c9405faafa3231225c524
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links aligns with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://coretry.ru/uplcv?utm_term=blur+image+android+studio PDF link annotation
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85264755483.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614a45f8e1d82---pikufix.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bda5e3ab2---vagilisoxulufi.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/40589674983.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/45242626822.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/xolabujuxa.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d688ad99a4---nimesosabuwefelogizox.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/54458518929.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/46835195034.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/xulamirafojoxigumagokow.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/wepikorulonulasujunoratik.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/28786547995.pdfIn PDF document text
    • http://ametansk.ru/uploads2/nenevewevukuziwum.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/64117407868.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d72b29ea8e---rugakewiwa.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/86136481076.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/99009301788.pdfIn PDF document text
    • https://kildevangen.dk/files/10481353172.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/21701873742.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/volazutesawivovakixexe.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/zosavo.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/61295413849.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9a848de541bbf65c4a5cea945ebe63d9/67092721288.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_off0000aea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BE 10744 bytes
SHA-256: 45a619c3b9d816c685bf46f1cb7689034bbb6fb4ac7eeb4823cc1d455ea995e8
font_02_sfnt_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 15044 bytes
SHA-256: ca8af67d2a11274d4fe2926d1d11b42cd93f3d3f36a530708cbd56e9a0d5e529

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