Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac36819fa797940…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 18:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fae56a054094d0fcb9a822218a929fe0 SHA-1: 1a53c995579c287f8dfa21450b3fc4a94dbfbf75 SHA-256: fac36819fa797940e7bbcfa1e19438bb4d1509eda9e186fc9c16678e21ce4ba2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=android+phones+software+download PDF link annotation
    • http://hooleihomes.com/cms_images/file/15525176369.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/30180412268.pdfIn PDF document text
    • https://securitydm.com/slicice/file/17266892823.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/93418409800.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410b863fce0---4018223064.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/19336676159.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/51248008495.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/nuvazul.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/38262757525.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202194147587907.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/57489028725.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/43280280217.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/solawasero.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/duxegusibajow.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/rirugunokakosuja.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/nuwirobalukar.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/tinorozibad.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/89540690757.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0114a6d8---totogi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af56c83845---xikilam.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/25690208178.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/4664116775.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/9097832655.pdfIn PDF document text
    • https://premium-house.uz/images/file/soxeraperekutaw.pdfIn PDF document text
    • 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_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 16528 bytes
SHA-256: d7c1c3b550655d604f266a100f4dcd2ead88bc31bc4575f0de1194c62b9c0813
font_01_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 10660 bytes
SHA-256: 7d30ae29cd8012eaa8af8ed2345c2e426789d5160bd653886a1b76b88246f883
font_02_sfnt_off00012be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1