Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde14511cf6d7b6f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 18:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: edd33aa85b74653c9b9c105d8a8d0428 SHA-1: fc87460fef4504f4b2e27616a31e4e9df4a4eea9 SHA-256: bde14511cf6d7b6ffddcd88c1bd4350ee95e3301fef6cd51caf0efe61cb4913a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links and a link farm on disposable hosting are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://beulahcooleycollection.com/clients/870349/File/31461022545.pdf In PDF document text
    • http://amphorabeautyclub.com/campannas/file/padatujifelalitunexifit.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca464cb470---56924858280.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608335659c21f---birivamojepuxuse.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/bogem.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/zubufekorusaxejupofiwusid.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fdac0c5be1a---kovujeronazasom.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/riraj.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/173f05f53e27214555d19dc88262f01e/6413625896.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/2p8cajt4vq6ff4quaifvbdegv0/wanifalatawote.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1c5064c16f90505b720cf1907595e37d/paxalotovavu.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/futimagopubeveg.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210721134434.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c03675aa---98791603801.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/wimixewodiruzozali.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/2848009369.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/71237333200.pdfIn PDF document text
    • http://usmleworkout.com/files/file/28277449098.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/nemilutusatimoluxuv.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbe0e391ea---mafesaloxeparu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8c0bf013---vijafim.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/72646630761.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/2708241493.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/ramajaxaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=viva+in+prosthodontics+pdf+free+downloadPDF 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_off0000bbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD400 10836 bytes
SHA-256: 5ecaeb9e0ea1bd03365797098fc0bcaf55c507265ce60fd158a798d5e78926d5
font_02_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 17276 bytes
SHA-256: 4842c829bec8465ade1f30758ca207dd27ad0344a231875705d62bca8eec453b