Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c9e49873e4d54a…

MALICIOUS

PDF

84.5 KB Created: 2021-07-16 19:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 218ccbd8f359f8e4c1666efce45f268e SHA-1: 2558a98009c3d1c36b9ec4622533f7775c52430e SHA-256: 45c9e49873e4d54a71279187a38e8199f9a3c8aa7c03cb7fcc0488982162ae2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate it is likely used to redirect users to phishing or scam content, potentially leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1fae2b72f7ff84d07e59864ca731846c/pudetiwoti.pdf In PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5fc3115c---mesufapajuvov.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/f3621b877ddee90fe81f7b041b7d11cb/50273269988.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/443a4cfa97eb04ae9e7352994022e7aa/79820544174.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16099bca208613---43621210055.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/45898283703.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/21916800722.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb20e3844c---40322110728.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/59068627044.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/92292465024.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/38725802931.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/bijifuvuxufobikavop.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/37161559282.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/28893905771.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7redoek2cm1nc2cl2g4kcjjsn6/7658003725.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/69edf388fad03988bcfc9caabe6b5cb2/tolulijamosobudelasi.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/2221942024.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0788f920---28565409035.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/lh6rjed9f4toccb2ok5l058ctg/80162486536.pdfIn PDF document text
    • http://szwygs.com/upload/59352288236.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/6166054071.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71e0ed826---38952354590.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9573f9c6f1---99938557375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gta+5+online+free+cash+card+codesPDF 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_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 10744 bytes
SHA-256: 33e3086a6f02d9d645ce940fb9a6e79332bce96bf9df907af59cee62c849d0c0
font_01_sfnt_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 16588 bytes
SHA-256: 70334b40b056a796fc4f965254a2f53f0536c49be28511c02e36d19e6940c9d1
font_02_sfnt_off00012cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1