Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f1c08b083db40e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 09:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c6e7a0c884f0e5c2eb2c4bcb61304cb SHA-1: afa3fb3edcead7271a83f95f376bd578c6972013 SHA-256: 49f1c08b083db40ece65e0851fba4cd47b15e95c0989f64d50559aa7ef0e6e9b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many pointing to compromised WordPress sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=ensemble+learning+for+data+stream+analysis+a+survey+pdf PDF link annotation
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6ee652e8984e1aa8db172be0e544e46a/xegulizok.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/lisuzovuwiwi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/d56to5j5a3ag3fd5pbged6cos5/woxujeg.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ouh9nufo7k2pqs7gns16itu0fp/69653011772.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/punowegox.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ikhc055qghqml9viavjskgaedl/14504004735.pdfIn PDF document text
    • http://letdentalab.com/img/files/tovadajibatajure.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/popegi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073f09046b90---pevonodudip.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219f3d1bf6e---farekozonuketu.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/7247731854.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/gakematijinerukisijogozu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2f0378c7ca5883d9ce856add3a408dbe/wovunezen.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607228175a917---xigozuzukizo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9adbde0cbf4d04e0ebb2743d270ec40c/virulororobabogezunini.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97c01687a---64839945998.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/xareke.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/68608f27b7144dc7b090027e4ed576e7/82294052167.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6a364ad5140e3028cbcc1fefbf9513d5/2063921922.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b3f9832d---piratugexubomilafofukog.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611371d84a88f---14702692768.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/nexarid.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/44410026091.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_off0000d2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 11244 bytes
SHA-256: e79d35971df78205fa4e25735bc16d96d0b818721d0a223b9058e5d2fac481cc
font_02_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 16868 bytes
SHA-256: bebe252b94f9c755e63aec45c439469f7fdaa0eda45884f69cba26f92d2223ff

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