Malicious PDF — malware analysis report

Static analysis result for SHA-256 56dc8e4ba3884951…

MALICIOUS

PDF

86.1 KB Created: 2021-07-06 04:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 07601ce26c3c39d35a6de026a9f5dd7a SHA-1: 64aaddca4a68e0ddeb68629678de997aff4cbb40 SHA-256: 56dc8e4ba388495127fb7d7a5644afe2c1bf36b82c805f8c95bdcd85848f69d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and link farm behavior are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/94016172644.pdf In PDF document text
    • http://bmcnx.com/userfiles/file/dufowujazokeduzuvesofemuw.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/46666067035.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/bajuxoxofunawo.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/coqetl4skua4nlk21das696ntn/mixoxejirudapejoran.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/et8ofsbs2nkihl7d1jdo4smss4/12876421974.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/lidibezesejofifivatafo.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/80524931820.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/490886613e417ffdc2d4208d1837d687/38065176161.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16249230661422.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/78447778692.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/xavodusizexogupilegol.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089eae76e884---76704146448.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/tigixerovapaz.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/zekebelugamukuburuwenej.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/842ab40baf197be899dbfce3e16a06f9/66557749472.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2411b51e---85081895503.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5951d2e9f---lelududemibekof.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d1e5c510244df7558e57612d537e3c20/vatubuvav.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/903296f6b40c6d7dea28cba01cbc9cf4/55980129747.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7bn2mnahrkl79ii0n0jfnnmhq/60385428784.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/p5dl8cl3uqrc7cc4mqkgbibb1o/91067842518.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ae29d16e4---wanenudewopanixaxetife.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/bomomukegebulalogi.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/162bbc05bcb366c8d95e0e55f6fe8bee/73263521565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=section+8+3+the+reactions+of+photosynthesis+answersPDF 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_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 16112 bytes
SHA-256: c04fa2aa2c3cdfbd7e43e78593afa7fa5a610f73c5de9853c3860753a9da00df
font_02_sfnt_off000130c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 11184 bytes
SHA-256: 2aaf2474eb2369c7b91560d7736f926531a356a58408a73c1bd571c68d27379e