Malicious PDF — malware analysis report

Static analysis result for SHA-256 04da67f17e724b46…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 21:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59d0e9861e56ebed5a98c682f312ee92 SHA-1: d29a39cf6e5663d53f06974cc5f785a19096d115 SHA-256: 04da67f17e724b4671e40fa46dfced07226a1ea7be83f683544c9e7ff947b10a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites. The document's structure and embedded links suggest it is designed to redirect users to external, untrusted resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea03335e1---88843711789.pdf In PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/58289153911.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4f468e562---zeterufodo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f2706278e373150f8d6c8b36f5a55770/57913506830.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/88351516854.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/muredizajigufenipekovo.pdfIn PDF document text
    • https://people11people.com/uploads/File/20257304272.pdfIn PDF document text
    • https://agros.net/uploads/file/bulidimiseromefevix.pdfIn PDF document text
    • http://gro-felix.si/uploads/4255703305.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/tasar.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/fixunilubaz.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/23921492340.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/90100596980.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/87504580744.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/43707481829.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f439d6f41e---gufagulavut.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb041683125876df6dca6dcadfaebfe1/28755382932.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/10078054406.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/94209287967.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/judupotanusijav.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/62869882317.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c646c88---ruxusakujil.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/ponogemakuduz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=minecraft+pe+appsPDF 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_off0000c8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 10300 bytes
SHA-256: ab4622406fdab66f526b177a55c1ade7aa4710fb30113aae193325d6786c40c7
font_02_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 19692 bytes
SHA-256: b2587a01866a4b115faa7b5d3046d517c8af983a2a93cafc9b646e7957b6e2e0