Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1c861a3c9fc355…

MALICIOUS

PDF

77.1 KB Created: 2021-09-02 03:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d069aed3134c2b6de1d9402c63936eb SHA-1: 0b71c5d5228cacdf64b73b6bebedbca3de8493c4 SHA-256: 9a1c861a3c9fc355f4b00bbfbd984c8cbfee1ca69187ff6b837a8b367eb59626
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=aspire+meaning+english PDF link annotation
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/28480794334.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfacd6c722---poviduvagijomizidedobume.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/68472844002.pdfIn PDF document text
    • https://dineflon.com//files/gejediregaxujesazol.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/nukurofazome.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abd31521b5c---fatimivuvuxesebi.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/lozisakotinejigokonem.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/78461796920.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c8037bcf482446a174bd2093c81e6eb1/19550242147.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609444909784e---38579254324.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/fidutara.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608206c2a4933---18957511785.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/niverelalim.pdfIn PDF document text
    • http://jarosi.hu/files/file/2695761790.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/822305547.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/wosarinevarapira.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/wekovirajatowipuso.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/41ceb734ed788a6d25b6fdc09c8968b4/rojafasiz.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/40574403676.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/fujotusenudux.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/wevovonemak.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/lumazedifinivisefilonije.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/fd7a3b2d824a36bbf051087840ff88de/90854927266.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/xabijubaw.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_off0000c7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 10464 bytes
SHA-256: dc026b3dd5298a0831876d1d5d7789ab482e79ff0fda499ccb9d1bcfd67dd6ea
font_02_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 18424 bytes
SHA-256: 92f8777644efb62a4aa1c0111727ca3d897398640973f01cca6378114be7255b

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