Malicious PDF — malware analysis report

Static analysis result for SHA-256 5735b6d107dd734f…

MALICIOUS

PDF

125.6 KB Created: 2021-07-22 14:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 22c25e19c383cb263ed1ad82f7f143ba SHA-1: eb26dce6bcf741a7926e2f4f48a6521c314387e7 SHA-256: 5735b6d107dd734f8a01cdd5e0f39a2029d5028b471ea2dee4441d15787ff066
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress installations and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t9au3df2o12ma5bstcsh4ikt66/retedugodulasakev.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b342edb5---33566997641.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/37400738437.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/romubuwuluwimusexaposafi.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/54393822739.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/4cc83828102ca9ec20e7d0a4fc2ebac1/sitiwer.pdfIn PDF document text
    • http://funperm.ru/content/file/83060295436.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae48de2dbe0---xowuvoravoxixavuninika.pdfIn PDF document text
    • https://mnlex.it/file/lorosexiresukikabi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c352b3097c8---90719583840.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/xolatazalojewolegamun.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/55249761729.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/36210333434.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/35190032142.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/ragefiromipebimofepokonir.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/dalejofisakoxitubuxufe.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/ditujazemosodenolupegon.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/lonezigofem1620621532.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/mosanalowidadupuluvobe.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608803cd23eb1---vagibelurofirir.pdfPDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/74353981744.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/lojusabivakozodamapate.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebd3c5e5f---waxudaselol.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/50502548531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=using+antonyms+for+context+cluesPDF 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_off000187f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187F8 11000 bytes
SHA-256: 65d4331d798d9ca7dc4727a6b243a04e6120b3bf205d2117289cc2fe35318792
font_01_sfnt_off0001a197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9A9 17412 bytes
SHA-256: d3d7a9316e8c3c10b611ef6bba49a755da19c9641c8ccad0d752ee876705304b

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