Malicious PDF — malware analysis report

Static analysis result for SHA-256 165f6fac0d54ff56…

MALICIOUS

PDF

74.9 KB Created: 2021-09-14 13:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1564eef58a94d71e74d11c2ec67f21fc SHA-1: 5de53e78a3b9ba3ef0d07cf8347e906d69d9b002 SHA-256: 165f6fac0d54ff566b26e3b34d826d55da82bfc0b0ac3ff15d1592a55f02a57d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct hosts, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/18725189123.pdf In PDF document text
    • http://portalpr-b2b.es/img/user//file/_0714797001630794879.pdfIn PDF document text
    • https://costarica4d.com/contents/files/45339618396.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/86934065559.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/befilejigo.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/91454602596.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/xokizutu.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/govujowiwif.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/60190387712.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/18287377240.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/17703324824.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aad21c345---rabakokegolevovuxinureril.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/lavakireretiwexafitaxapa.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/sapesuma.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/5418967608.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/70715443901.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/90384175324.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/kutariser.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/70465037588.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091301471224.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/mafugararagipovuz.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/sarobuniguporetojav.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140224b5a0ab---81631945172.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1fcbec645c7d2794602271bfaf62e260/woxumufulawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mzee+smart+led+tv+price+in+pakistanPDF 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_off0000bef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70D 10768 bytes
SHA-256: b076c99b1b27e118fe51389a75a679d82d0905bc1d8cc7be00586192edfbc733
font_02_sfnt_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 17280 bytes
SHA-256: 8362e7019c11a4f33ae680963757936206e6e504ed4084aaaa9f46c2e33c1494