Malicious PDF — malware analysis report

Static analysis result for SHA-256 620d96b5451fd16d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 12:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff81840ea4d8317321d515ce54c8cf6a SHA-1: a2f1d2e1ddfd72be7bb425b74bc6e2acca568232 SHA-256: 620d96b5451fd16d0bd0766981748f008afd6d7e787d61bd99ee69e059cfae66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the nature of the heuristics point towards a phishing attack that uses a lure related to 'dungeons and dragons basic rules' to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=dungeons+and+dragons+basic+rules+pdf PDF link annotation
    • https://edgecs.com/documents/fisafusepotajifinuganurek.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/4b1nd32fses9bqns4h5uhnc8e9/83803193273.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/4hepc42lpa1hiv9nsrrabk6865/takusamanitunok.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/jedajisunedawu.pdfIn PDF document text
    • https://iwistw.com/upload/files/magelijuxifil.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9d855ea71---mukikedepitupat.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/nikoladujajomozutupez.pdfIn PDF document text
    • http://teifsepahan.com/files/file/kikafi.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/68560105514.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/tatomuweroma.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137604e8331b---42889992558.pdfIn PDF document text
    • http://perksys.com/userfiles/file/50154951431.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/rozenibagemujafatok.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd6283b560---xuvizogogobanef.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/9198810852.pdfIn PDF document text
    • http://vit-physio.de/file/64188454067.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3q68d4e6mhj4i7bcv3d817o134/wanolofezuxilagusegado.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/74085489187.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/sarig.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/98689612124.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/besupefu.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/63583129176.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/30319369047.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/jajozovulipuxutumimi.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_off0000b1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D9 10940 bytes
SHA-256: fab94929d501fa71c84c1af7997d506e84b29add9046b6b1b8c6a457ae2c0bde
font_01_sfnt_off0000cad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD9 16884 bytes
SHA-256: 93f282f8a0a6de09be36e56977942f1fd4afea94e4711bfa0fc341674c6861cd
font_02_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1