Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c6757cb4868871…

MALICIOUS

PDF

89.4 KB Created: 2021-09-02 02:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7a712147b5fb8f8fb06ab1fe15f8dcd SHA-1: b45dfc2443c15f5d774a0f1d02c6641e71552e26 SHA-256: 30c6757cb48688712e270977aeb22f284d54149a11b8d9d3addb681f9126bd20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a common phishing or malware delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=big+o+meaning PDF link annotation
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc6d597da81---kifubidokuw.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202152525567722.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/49411981728.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b35e6b064---rugelubanesofitag.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609943ad6cb87---biboxazi.pdfIn PDF document text
    • https://noddy.nu/images/file/54243620989.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fcf46245d5c58ddbd48ed3ceec28502d/buzareluzigetoxuvefule.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/nizexufep.pdfIn PDF document text
    • http://fygl.net/uploads/file/070454459195.pdfIn PDF document text
    • http://accronline.com/userfiles/file/68522753092.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/da193be8a0eee3bc973bb7d3005271a5/52694176050.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/1ddf3705869cb4c0d68d9bcfe1152dc6/82366885187.pdfIn PDF document text
    • http://digifast.cz/userfiles/17087660222.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dac5c0ea579---kigumuvuki.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/78123745912.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/37949180982.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/68c1a2d247dfe9611d8b972d6d804208/2861183652.pdfIn PDF document text
    • http://kvrhousing.com/uploads/nefubedijepokegelumawivu.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210528054500.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/wutek.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4721745b---senapepive.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/66395398543.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_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 10092 bytes
SHA-256: 7f287515597d2ab31ac44f80f6fe250e84b898088b0b9e80772e03ba2814987a
font_01_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 22184 bytes
SHA-256: 15f460ff1bd22cac562f59be15569da1ea7e30714ed3685a1521e89ce96d59bf

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