Malicious PDF — malware analysis report

Static analysis result for SHA-256 e383f8b47769d672…

MALICIOUS

PDF

71.0 KB Created: 2021-09-07 05:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f909d9b3944da4052e87f56e5624681 SHA-1: 44a1a96616d415b1a5bb0926010c6401217f48b3 SHA-256: e383f8b47769d672989f9b6f64d7eb73003f0cfc21af9777e7b27f4700b63240
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://ferrogep99.hu/static/media/file/rajajolamuwizotozo.pdf In PDF document text
    • http://baoveantam.org/upload/files/kupaxag.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/58921214209.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/70210248434.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/69745979348.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/54178028967.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/dexebodanuzanubot.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/96508988428.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210811_4A829B555B2D7321.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/69865893426.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/kotile.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edda83ae57---momutunabuwojoluxidelu.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/kadikoraka.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/poremakujobukekidatezen.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/mifokabebuziwifilu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160899a2d68b4e---redefozasewexefijegid.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/fogizesadimoxavunodupus.pdfIn PDF document text
    • http://rafaelokazakov.com/file/88038701953.pdfIn PDF document text
    • https://paperland.bg/uploads/file/daxomoxogaxewajet.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608029cab5162---jolesuzanoxuwi.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/544567607.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/lejigujipekog.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd8ae8217d---judivepiwasovinesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=negative+integers+worksheet+adding+and+subtractingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57E 11064 bytes
SHA-256: 84150309f0545afceefc20643d8dfc749b4429ceec2f1718ece281dc9df85d35
font_01_sfnt_off0000cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 15464 bytes
SHA-256: 55ecbe09e6c25588f55dc718715a6e27b606a02220575ac69830ec3215ba2767
font_02_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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