Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c7596dc406090f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 19:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32c58da7e076da783c2a8db98501bea3 SHA-1: 73cd3c58b20fcb7c030a27906f19fe8cb1e004b0 SHA-256: b7c7596dc406090fbc94acdcae6649a92f6734dd059a0763ec1d8bf41a5448ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, pointing to numerous compromised websites and disposable hosting, likely to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/34b1eaf9a021a551cca2ba503372b4c0/17098489889.pdf In PDF document text
    • http://amon-syotengai.com/userfiles/file/rusivesujit.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a9038234c---39632173147.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085be8886fc2---80221250697.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/85559346020.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zosaxobotazuperenemetopet.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9beb32171---viselajokaliwif.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/balifebebubiwogezusipa.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/13673330029.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/92060492307.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/61520644417.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/gizerulovasorubunew.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/jafirubudofobubifadozig.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/jononuwev.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/29671070748.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/34465197389.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/mupekevoganapugo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607368ae1e0a1---wavebebaguridisokebon.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/caa45a9a737a28b0bca348e04dbcd07f/25471475377.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/73174314142.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/89403860623.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d048a34300---jezakebaw.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/74387917338.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/21169950507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=usa+garaj+basculanta+manualaPDF 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_off0000d0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EE 17312 bytes
SHA-256: c2d0c7c6c5b3d59e26b74f33eeae2d23a0866e1372c4bf553e6b451d21723c15
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 10604 bytes
SHA-256: 8bacae0d10c7adaeb493de330a7022e6d47a7ea2a4b1e8e9638d0519f816640f
font_02_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1