Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fe49cef4a914cf…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 08:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e7b930b24a0c36218aa81a9c0712ecf SHA-1: 855355024f52b2cd7e321fc2f8d340da99c696e9 SHA-256: 12fe49cef4a914cf393caa79b15463285e4c68702f6302477499ddccfe433b3a
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. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://younewstoday.com/task/userimages/file/21573200698.pdf In PDF document text
    • http://tks-forever.com/upload/2021/08/03/file/54301759467.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160909346a1c4a---83505476812.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/68705279072.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5ec5a7e32e3621df053bd4ce8a5114c0/21454502411.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/799347025609807aeb444a.pdfIn PDF document text
    • https://businesslife.com/content/file/36930914961.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/v5i0gdvrko3vruptjddljt61p6/48020786635.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa58330f1---zopufozaxasabomodovokikep.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b6bf3e2a7b79f49b2402b8804feff9e/kokekogim.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa59d0bd8---43242724156.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/taxoregabofuman.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/93843375190.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/fufubutitujovojem.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/24046441419.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/50848991007.pdfIn PDF document text
    • http://chayka-svg.ru/files/2112129697.pdfIn PDF document text
    • http://friulanapanini.com/images/file/29899965346.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/wutojedudemususe.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1f0cc4ee81d78424a1dfcbc59ec2ba7a/2013948549.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/70124486233.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de67fd4b081---rixufimuzuzige.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/55788188463.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c785f9c4f8---58224085503.pdfIn PDF document text
    • https://wagaskar.com/media/pawol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gothic+story+essay+pdfPDF 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_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 10720 bytes
SHA-256: ff86fb5d386a2560560cbde9e72da995a42c3fcf1ac7a904a0b89bea81b87082
font_01_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 17328 bytes
SHA-256: 59acfb90501ff19908fc4bf2e8c9eec5fbf512788220b17b939eaafef8b1934e
font_02_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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