Malicious PDF — malware analysis report

Static analysis result for SHA-256 247281d091db24da…

MALICIOUS

PDF

80.9 KB Created: 2021-08-17 06:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 428d076f470417f2bc85cca8d99dbca4 SHA-1: 6bea84304eb42103f857e670c5ee807ad209e143 SHA-256: 247281d091db24da077143ef1a2f1eb236cc40e6e678b1d3851beab557552081
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous links pointing to various domains, including those identified as compromised CMS uploads and link farms, suggests a phishing or spamming campaign aimed at driving traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://singer-island-condos.com/userfiles/files/benini.pdf In PDF document text
    • http://hitecds.com/userfiles/file/funubotunipoxebegidanejo.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/mafunidowoferomoze.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/93917204728.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/23416878947.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/6cf2288f0411bdb1b1cfbcbd70baec11/54474849367.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/sufek.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/kifoj.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/38644947161.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/xalela.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8d888a3d---40211745454.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/89632365424.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a25aada649---1597870211.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/xuduzimiroduguriwiwajok.pdfIn PDF document text
    • https://ottopianos.nl/files/mojodilapewujitanoxaw.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d8af3936eee---kofibofajor.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/julibinemino.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/vepijexavilalebanu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4446d42c12---75130533278.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a91ccd0d969b6cff4764f44ec3f4717/37602858080.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/98770672629.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/p1t19p6pn2c6u3rf21e8on9bqe/90829780512.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/74781989108.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/46543765547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hungry+shark+hack+mod+apk+android+1PDF 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_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 18364 bytes
SHA-256: f3c44fd1d147c755ee2f811497364da7d0baa8ed6ad11e7393d974778a16b862
font_01_sfnt_off00010473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 11032 bytes
SHA-256: 96cf399b49170c929285c8fab5dd14784ece11d531566dbecf612e2780e987f6
font_02_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1