Malicious PDF — malware analysis report

Static analysis result for SHA-256 0023dcb9a548d5cb…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 09:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7309f358b8bacb973d32961188a7dba SHA-1: 8034a49582150edee0b8661264a7136669d0e34a SHA-256: 0023dcb9a548d5cbe6bc32fe63d9bdfd8c9b9767e91c96167dacae9dcb3b8b2e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised CMS uploads and disposable domains. This suggests the document is designed to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://verkaufs-akademie.com/userfiles/file/96796983601.pdf In PDF document text
    • https://landi-bg.com/images/file/78198407111.pdfIn PDF document text
    • https://retta-bg.com/userfiles/86727205527.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/90e8150a10fc5a558b2df8095584d400/74780988272.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/67442853525.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd16e607af2---kazifuximinupuno.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/8436ff52d7db319d038ad37eb9b341fb/66692207441.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/13377988094.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/tezuk.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607894ec7e733---5095915566.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ga8nadbq1bsmo380f24v6aumj7/soxinutepasitatemikexa.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adf33392635---64049604357.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7e439d1af9---2019338937.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/a72uh85moje77phr9hc6dm29o6/99477315860.pdfIn PDF document text
    • http://emeat.ru/var/files/55375013989.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-2/20210702134302377020.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/28363597718.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/70070477056.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/lijugezimepowo.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/ripawewoxakopujenid.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacd765b23---saloxosavefukulekavof.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/qcpu94gvlnel3sui4amfl6q8pe/92858610613.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/3cf4ed021d92c30e4985797b96ac7c5a/55456247899.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/gojimosere.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/83722314203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=meaning+of+mendPDF 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_off0000bcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF7 18952 bytes
SHA-256: 6b8fd9a9ce3ef845377fb66e66b857ee6c9eed1a3460401b86a699b99914c40c
font_01_sfnt_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 10280 bytes
SHA-256: 42efb6494238a037f767d454e8764d2bf931959d47c4951f10489743df533282
font_02_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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