Malicious PDF — malware analysis report

Static analysis result for SHA-256 4300ece36fcb2d56…

MALICIOUS

PDF

84.9 KB Created: 2021-10-05 19:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7cee2809cc3b6b168b13cc757465e371 SHA-1: 3fd9ed6e921c8a1016e7cbc50280879137d06d71 SHA-256: 4300ece36fcb2d5651ec2321ef506725819a168bab13e10ff07626401e513578
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, and the 'SE_QR_LURE' heuristic indicates it may instruct users to scan a QR code, a common phishing tactic. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wastran.ru/uplcv?utm_term=how+to+draw+a+anime+girl+easy+step+by+step PDF link annotation
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/301ff9d03273770a41c00a1ddc16a769/wabativipiliruviloki.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/68302894821.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/witepibuxub.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/38062854866.pdfIn PDF document text
    • http://gotween.com/userfiles/file///patanuxepew.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/13275726346.pdfIn PDF document text
    • http://posuni.com/userfiles/file/73544890853.pdfIn PDF document text
    • http://drironcat.com/images/file/757193677.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417abe93442---nimuniriwibatorotibabu.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/58345800559.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/riterubelidatipolepuf.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/dewopobobolokuvagitad.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/46513116952.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/8283509179.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/migapiraduko.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/labefanumi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/023610a1cf6b483a1ad6c7fcad9e8748/23670250468.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/timejavoke.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6ecc94bb7---65434155079.pdfIn PDF document text
    • https://festacontinua.it/public/file/93926581988.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/dakiw.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/51073109397.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/51692963052.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/45882017976.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/19277039886.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/wajawiposozomaputaro.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/waveziwadexesu.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_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 11064 bytes
SHA-256: 8af6482e638673ab61297ce5ca62f893990bd0cf751905bb7927cb9b0a06c62e
font_01_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 18528 bytes
SHA-256: 9a70d3621b5572ab6fb0e390e155600dc4917539742f9d94856c9ffd9599e327

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