Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf367ce61f05aac6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-10 08:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac01351e0ddb8ea6f66f7d18b1f74005 SHA-1: 95a102c4a788dae223ba2b2f633fd9e97343ea26 SHA-256: bf367ce61f05aac6cb556bb910986f66db56cc0d2a05ea041e930353a5441a6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on compromised CMS upload storage suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f0424e97c7f459d55749675b1d4c974b/17119186421.pdf In PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210908_5FCF70A807B344FF.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/wavumolibomelopevopapu.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/71536006660.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4e772935---38599123592.pdfIn PDF document text
    • https://red-adlay.com/upload/files/35530570915.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/67739214807.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210901122532.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/bigopumuvuvorifujowoka.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/93311048277.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/fusapudetejunulimis.pdfIn PDF document text
    • https://mmszke.hu/files/file/94095147573.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/waposafelete.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/38580536391.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210908065808.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/70149105188.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/15884242653.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/79363884604.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b747e5ab---91802852117.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/jelavusaj.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/fagidapalale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cross+dj+apk+modPDF 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_off0000b133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94A 10336 bytes
SHA-256: 6c3d733bbe8381a184dbf4718ea0bbbce1bb620be836779fbfe4092a2aa040b1
font_02_sfnt_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 15604 bytes
SHA-256: 967984f21ee751f396c608a201359e3f93840bf54dd3b9cd73278c2a26f03b96