Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56458bf8f272e5f…

MALICIOUS

PDF

77.4 KB Created: 2021-09-29 00:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a82cffbdb39cefe286f02cea497596eb SHA-1: 0443d1451568456c3e7fd6e3a477065f9d863495 SHA-256: e56458bf8f272e5fa741b6f6003e6298a5ae5d9c6bdb8085351c1c1854592232
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URIs, many of which point to potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and a link farm heuristic indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/52d54f834e5d1693ea45ec8a60aaab48/51962600129.pdf In PDF document text
    • https://onlinendttraining.net/files/46564855048.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/xejadenozakokopigud.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7e7df7ceadaf3ccee936f652cfafa0d6/doxibewagovojirile.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/katajufatifivilizidap.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/jikoxukesawe.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/nilifuxutuxunojugonexatin.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161538ab02e48a---14266618790.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/75249604940.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/87857125786.pdfPDF link annotation
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba4b06155---vogaxugesovikawitif.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/dogutubiroweratuvil.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210920091452.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/17349484976.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/42093777256.pdfIn PDF document text
    • http://live-net.it/file/xajadadubadelawik.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/60991506820.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/12096739777.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/18775929534.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210911_034307.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/599db722c7b0cde1f2baf2c3bbabda8f/forupexetoludipe.pdfIn PDF document text
    • http://toroisg.com/public/images/files/27528754098.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/nojuxidogizoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=xmodgames+8+ball+pool+no+rootPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ee6186d---dasumozuwibofexebidojub.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_off0000c1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CF 10996 bytes
SHA-256: 970bc2bf13ec8d14e393a69b37a5b3f8757e0fc3f283d924cccbb2359f0ec117
font_01_sfnt_off0000daec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 20040 bytes
SHA-256: 73cd71101e017cb746797cd71436b09cdebebfdae614e86889a66a2254d7803d
font_02_sfnt_off00010e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1