Malicious PDF — malware analysis report

Static analysis result for SHA-256 14dfe8ee3139c5b3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 21:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: deb4ff6d865ce6f1d68f9f6ab1ee0607 SHA-1: 4a699f3513c8b94e3a0a9329248c9e9b427b6218 SHA-256: 14dfe8ee3139c5b3d90ce635745a0ce372d09adc73e7743f19fb2e1287d5d749
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised or disposable domains. The presence of 'utm_term=photoshop+cs3+crack+file' in one URL suggests a lure for users seeking cracked software, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=photoshop+cs3+crack+file PDF link annotation
    • http://csc028.com/userfiles/file/20210912075421_vdi0b0.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/65936978238.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/33028107548.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/nizofozizenukulomutusilas.pdfIn PDF document text
    • https://membermimpi.com/contents/files/tubekumesavapirokajudix.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/61260151941.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/59381737968.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/37396652155.pdfIn PDF document text
    • http://agro-partner.com/Image/files/jiviwisovuwevawatapazo.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/814e577ebdc953dd63d3ef472667bacd/48741907080.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/6362431887.pdfIn PDF document text
    • http://sun-eko.eu/files/file/botit.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/nodajarelusadoxov.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/muwanifuwub.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5el2k56cn354chbubmgerkkg4m/nujorutugenazadibufu.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/lolawuzumadat.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/vominofajixisulirip.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613260327ab39---jitosexadanu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614257e782dfd---54405865298.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/giliguwarolukoduj.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/dipetos.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/90953809577.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/37977951824.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/koturelunusuja.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/majuvumunox.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/17156808010.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_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 17660 bytes
SHA-256: 5760122bec6cba434569333cf44c45cdb7114edf55203cf797586192a60b32fb
font_01_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 10736 bytes
SHA-256: 2d5c0406c0f8ee87151b57370d7a5055989570270a5ae4c70a7a72c030af18d0

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