Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16be953620d56e1…

MALICIOUS

PDF

86.3 KB Created: 2021-10-08 00:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc4c999147a6fe1967078131fcb80049 SHA-1: 946d5b56f75518c935a83d96b5a475c30fc7da8d SHA-256: a16be953620d56e1b2539ed0802fae6ed4da6ba8faaaff41ff5f6847b69ee1ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://businesslife.com/content/files/genula.pdf In PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614200d13bc2d---22217480997.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/il61hdh9b7iphnn148t1erkpi1/tuwesif.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/noweniduwulozesaxiv.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/malunupojivigupudufom.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148b6d859afe---tegenufejobez.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/88963912729.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/85601840407.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0f00d3fc4---tevomane.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614efa2e6b84b---32980467745.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a16999b363---23569662499.pdfIn PDF document text
    • http://climtech.com/files/files/natiduparalabagokaki.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/82150838976.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/72668188321.pdfIn PDF document text
    • http://suyogmaratha.com/editorimages/file/94534331185.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/18907434471.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/21359331180.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/69174687659.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/lodafolorivov.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/50874578572.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/xunevogalaze.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/lubarusiri.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/93588282422.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6abc1e9b5f810093f8bb67ad75cb2031/85702949464.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jv35dckjfes99enb0b515m452c/44065615637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=project+management+a+managerial+approach+8th+edition+solution+manual+pdfPDF 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_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 18124 bytes
SHA-256: 7ace923c1c2fc076c1357406ca064a49c6723ef5d42a598b7e285bc460d75997
font_01_sfnt_off0001176f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176F 11508 bytes
SHA-256: 8b0e16bb670ff5aa31bb8bc055231d134a41190e66d8466945c3337e19d12150
font_02_sfnt_off00013242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1