Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d6adb57e084b07…

MALICIOUS

PDF

91.2 KB Created: 2021-10-05 20:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 22bfc75a107ccdcda10c7fbc23b3775e SHA-1: 56cfd65829c4be826d58eb402cc91b2b24aa25ba SHA-256: 55d6adb57e084b07e65896ffa6feb7697b76f99a2c0afa4b3ec2331791d87cdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farms points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://synerhu.ru/uplcv?utm_term=eur+gbp+exchange+rate PDF link annotation
    • https://eownauto.com/uploadpic/files/xuwebaxobuxivudi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161537ebb274a8---vegefimadalepimonolexaw.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/dodavifinaliguzogirufenef.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/sunuzobapuselotawato.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/natigalig.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/bewokepazus.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/zapasinemeb.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/57763650256.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/xesino.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143b87cbb4a0---99645659988.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161562616c1a05---60118708800.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156d712a1f62---89195523619.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614c770b298a8---7909419217.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/28988274721.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/sapeje.pdfIn PDF document text
    • https://funke.be/data/file/26736996132.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/godikikirapozibenutapatu.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/vujasodunedegadokokut.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vebodotizutalusa.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-10-5/20211005070634702453.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/xebolosisabef.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/wugolimezazimalidojalefu.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/36232182387.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_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 20136 bytes
SHA-256: 72b135458c7d54968531406bfc1ea824a6abffc4a2b3cf615b1e1e8e42e8f3e1
font_02_sfnt_off000146a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A7 10552 bytes
SHA-256: 76a313f94b363eedfe74a7138e41469a2ab8411daf215c6eeb61490faaad93ec

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