Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bd063a620812e4…

MALICIOUS

PDF

86.2 KB Created: 2021-09-19 08:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f24bef97963604c7e2cbbad69e189cb SHA-1: cb6d6d74dd598511774f537f000fb290081d2071 SHA-256: 82bd063a620812e45d676a2037211eedcd61fc29cf66bf8b6935a1e204ee8f0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The presence of embedded URLs and the PDF structure suggest it's designed to exploit user trust, likely as part of a phishing campaign or to distribute further malware. No scripts were extracted, but the heuristic firings strongly suggest malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://archism.ru/uplcv?utm_term=gospel+of+luke+bible+study+pdf PDF link annotation
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/giwudugufuma.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141655414eed---7859796187.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/17512959263.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/11903295426.pdfIn PDF document text
    • http://zaiger.ru/img/file/zadiritosu.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/notekigakago.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/9965815949.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b76a936f---92073594739.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210918171646.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/7824326617.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/6835004898.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/fimodipidufuke.pdfIn PDF document text
    • http://boldogelet.hu/media/pajedodagolupojodetopazi.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/50431034108.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5tge6qomuvfs521e591v08em11/sezomevedevav.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/wopufofopunoxodep.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/17475265630.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/dujezakorijese.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/birogopaxezifu.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/71536006660.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/75968355008.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/5526781214.pdfIn PDF document text
    • https://equalland.com/uploads/File/mududex.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/papaduboragu.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_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 10612 bytes
SHA-256: 5f9b70137a3814f1cb6539d6f376e58479e3c3cc5416f2fd1aa74e94f370192d
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 17796 bytes
SHA-256: 87f74a270b2b3b7708bb59b7fe9d39c1cb69b50ab14f54288bc49c78831bc90b