Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ec374fe95d2d49…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 11:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 822111521c5a530431d0eefe7261d9d0 SHA-1: b5d37736881b1a8dd51c39fc87c32c06b5a058cd SHA-256: 67ec374fe95d2d491f3733bcc274adbe49a9f8ded6e99052f07be1939e0e3f1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, flagged by heuristics, further supports the malicious intent, likely for executing further stages of an attack or facilitating phishing. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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 https://irlanc.ru/uplcv?utm_term=nice+words+to+describe+someone+starting+with+n PDF link annotation
    • http://banglenhospital.com/UserFiles/File/82476374042.pdfIn PDF document text
    • http://delve-cr.com/uploads/7158860878.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109020148508744.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/73524972458.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/rurapavesevonubew.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138132098fa3---tupapef.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/wukikitala.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d03c51ae6---40630452450.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/47654956353.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109121846233628.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/wadekipul.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3564d38c2322414e96eb32ed93ed05f9/35509551953.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/bitavegal.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/kp8uokvbrs97obqe5o5s8ik41o/xenitokesopupizafawesu.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/21549349585.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/nuvelazuxuli.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/pomoxiwun.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/edb03376560fc0408bb47db2945bde8d/23285479989.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/laburamaxolifejudebe.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/78395920106.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613eab5e461f6---9135113182.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/favujedokode.pdfIn PDF document text
    • http://pi-consulting.ch/download/tewixurulugifamojar.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/6650924006.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/vewabidizazak.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/ximugap.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/52009218310.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_off0000d429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD429 10976 bytes
SHA-256: 907413e00f099fb5c519ab7f68c9eb40d2aec7d8ec91cdb56626495064b25f93
font_01_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 18056 bytes
SHA-256: 8cac7048ad7d92618e4545ccd571864ecf596de27ee74e6999052de1c6ffa186

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