Malicious PDF — malware analysis report

Static analysis result for SHA-256 c802785e122927f5…

MALICIOUS

PDF

73.5 KB Created: 2021-09-26 20:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1683449e0644db0278c17a36228df24 SHA-1: 7699d95c43c870024aeb037a2d13ae2cfb461c09 SHA-256: c802785e122927f573586213b862e3e9f2310b7173e866259fc42bc3fc5cf198
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified multiple links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad0ac35b41---87776556502.pdf In PDF document text
    • http://epmachine.ru/d/files/vikes.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/kivuwezusepixatezagox.pdfIn PDF document text
    • http://offerparts.com/upload/files/49145141067.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147bea65ad5b---tuwusuxokubizedakoz.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8dcc374e1---91132399472.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/nikuxixixofemufiwe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9obscsf89tgsm0qf3firpobdcq/kodaxotekerajidumax.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/93289584608.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/sawixutovuva.pdfIn PDF document text
    • http://fygl.net/uploads/file/241008397649.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/xowesuf.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/9962431938.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/kokeziwesagaguxuvivi.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-2/20210902103434282618.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/55325520981.pdfIn PDF document text
    • https://moolans.com/uploads/files/73520097069.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/37510792459.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/faxuv.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/56804993852.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/danimawuvubemulibi.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/29995001871.pdfIn PDF document text
    • http://simoncaulkin.com/images/geredalozodof.pdfIn PDF document text
    • http://automag.pl/userfiles/file/gigavofemareled.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/70066165464.pdfIn PDF document text
    • https://www.nissan-utilitaires-melun.fr/ckfinder/userfiles/files/kedem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sync+outlook+contacts+to+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_off0000b82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82E 10612 bytes
SHA-256: c038e29def3cb14e665d2131158b30c007cc51d846e16bf6ab587b865a4aeb85
font_01_sfnt_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 18612 bytes
SHA-256: 984f93db7eb737d27bcf9049ec9e363f27baafa27f3a103b386b1203bacfbea5