Malicious PDF — malware analysis report

Static analysis result for SHA-256 441bde1cce1e55ae…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 20:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5d0d488ad2afba5199f451cd2eeec73 SHA-1: ba6729f38a828cbf00f1adf0f03da6f35f6a267a SHA-256: 441bde1cce1e55ae621d3400c30269047052e7bf39520ef54741f971c22fb050
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document functioning as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://highdeal.linkeo.net/ckfinder/userfiles/files/89210356732.pdf In PDF document text
    • http://benetalent.com/upload/files/20201042668.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/57g0tsr9s79btorfjvdodldis3/wiwitusokajivagigebo.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/muguligewoxixadizukaba.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/b0950fe1f7b5c32506940bf44afc0f28/ladun.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/2232366243.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/80134027102.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/35531735581.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/jedolole.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/38207856882.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/27718964415.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/58918420005.pdfIn PDF document text
    • http://suma.ca/upload/editor/file/welajuda.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/45518623551.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/vadefo.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/71476614985.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/laziwugamazupinulobeku.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/nizovusulasodado.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/lapugesilexuw.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/93822966526.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/ac6f088430725d15afef589fc8bfd6cc.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/zavubilipitijugefajuxo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e73f254cb743382fd080b943dd3dc19a/72656221466.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/xofixifelopuguvaxafiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=run+windows+game+on+androidPDF 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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 18004 bytes
SHA-256: 91ceb3defa3e054cf59a2d2fab2444d98ad1a520e01faf10807555080c31642a
font_02_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 10676 bytes
SHA-256: addae277b68946d0f1c211f96ccc43d0ff31fc8e9e6e1e41c416afb5236854ad