Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc3694e2206b33f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 22:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dc95bd2653fac274f3207f81a8779c29 SHA-1: 224fb25fd32ab3495e71d88ba21dbcee5094a424 SHA-256: 7bc3694e2206b33f1b62367212e85360db15d45235e76ee65455c0a355c73d14
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://onlineadda.organicemall.com/ckfinder/userfiles/files/bisojolupobativerob.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161317fece3f72---67391755737.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/49068663079.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/jamifelet.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbe33756a5---84779657841.pdfIn PDF document text
    • https://777mto.org/contents/files/31663352382.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333aabc229d---2922291991.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/52207809758.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/zasozilimezimimawunolu.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/75559704035.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/jiwutenirujibofolumilu.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/wopobosotug.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/kifuwetubaf.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/61219788332.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/wegadapezuwisabasumopi.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/5024937621.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630650836.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/49489520046.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/80164205797.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/batanabefujinilosa.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/5821277709.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/72503839869.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/3883186307.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/16750126209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tekken+5+download+for+ppssppPDF 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_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 17892 bytes
SHA-256: 9fe621380250bbf0edd7552e66733dac8d33da287d4dc3e6f42485f888d3e029
font_01_sfnt_off0001063e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 10576 bytes
SHA-256: 29a3818a0cc76b7bbd2b6c8de725ad6524aaa44d639edefd92935e6d20a300ea
font_02_sfnt_off00011ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1