Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77a9652c3552941…

MALICIOUS

PDF

91.0 KB Created: 2021-09-06 18:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76547c87e9459cca5ab074b811f7c602 SHA-1: 29198a7470bc8ea859bce47e6d81bf007ba405af SHA-256: f77a9652c355294106f7769443f350a716cf895da1c193e82b6bbfcac0c736e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or downloader lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://agataklimowska.pl/userfiles/file/mopulak.pdf In PDF document text
    • http://liburnia.pl/userfiles/file/46420609778.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/19354504995.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081203607803---wupufaxuxazamojulikarulot.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/dugifoloxugiraxu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09dbb4562---88250888307.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/goregog.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/54523003799.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/4129b786a472f22bdaa3d0df9aca269d/78181362327.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ecabe220a---50125965321.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/vexujodaro.pdfIn PDF document text
    • http://airfa.it/userfiles/file/38347085147.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/duvagadalobemovopeveluse.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607830daeca1e---7141570369.pdfIn PDF document text
    • https://isosklo.cz./uploads/99757180680.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/tutofajozudubusosomesigaj.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d428741578f---wamasukuvepuwoto.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c0de1fa7332---kuvusijix.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ba984a568de---63277287992.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/lekurirudezisa.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/56074044448.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/3021127509.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/jitawakefoletoniwijix.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/99222416358.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098347e7b997---69745109384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=online+converter+pdf+to+jpg+in+600+dpiPDF 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_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 19436 bytes
SHA-256: 45c21974720f1ac92ffc15422722175a9ba2368d48cc8794c60dcca4744c4ffb
font_01_sfnt_off00012c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C62 10976 bytes
SHA-256: 0b0d0d7a58038a943fc981a344d265f83f692347f4a54c226943751b4ea5f586
font_02_sfnt_off000145bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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