Malicious PDF — malware analysis report

Static analysis result for SHA-256 99360dc5bee8c506…

MALICIOUS

PDF

74.7 KB Created: 2021-09-11 21:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9912b7c7c07dc9d5a5af0f7bad19065 SHA-1: f005973e5628bea133210ca2127b9cb83256a09e SHA-256: 99360dc5bee8c506acb8cc6458ac5c082f80e0bfd6f7e62c4fb3fcb62cac1c1a
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://antwerp-reefer-tournament.be/argt/files/79145082556.pdf In PDF document text
    • http://cmuniontravel.com/userfiles/file/fiwejodojibuxano.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/53388242146.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/lepagoxerot.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210903/file/fojojojewoda.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/77958075515.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d7e58078---foxezudozidid.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/384aobnaicvnsdeh6j95f3sato/38219314241.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/xoxafuduzodupubirive.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/bagipif.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/rakamuzavigakejome.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/nuzikozepubitu.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/67970651292.pdfIn PDF document text
    • http://allycatering.com/userfiles/sepaxire.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/580b1be592948b67504f27d0047d8d9a/baban.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090402311273499.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210908031434.pdfIn PDF document text
    • http://staropolski.net/Upload/file/50740210293.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/jagasupes.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/19079728838.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131764b27533---gesijuxekejig.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/dujogejolebid.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/2267399233.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/51929538596.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/16963782336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tekken+tag+game+apk+downloadPDF 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_off0000c1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 17036 bytes
SHA-256: 631c77a2af45cef5bfb1f58dd7b8fa412db11eb7c47ec749deb3c0515b8e40b4
font_02_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 10516 bytes
SHA-256: 06ce0a449a5fd87e14fda3d4e63c9bffa8b1d0929bdef2f4c9cb3a9eda0e76c4

Open this report in the interactive analyzer, or submit your own file for analysis.