Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d63420b26a35f4…

MALICIOUS

PDF

73.1 KB Created: 2021-08-29 19:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c976166722f0c8943c589a0178e8e0de SHA-1: 70d2cfde83a8213dc6229c8f530c607bb73da728 SHA-256: a7d63420b26a35f4e9a4d6d4e13235e704f3e477fa0d97d54d63dc89c316221b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c30112178ca---zexego.pdf
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/38761291348.pdf
    • http://chrisdepanneservices.com/Sites/cds/files/30156463145.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921d3f63fd1---muwekilefu.pdf
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/muzigekidakedegoje.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607da24cbd669---89302091274.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160987dee4c895---91111740390.pdf
    • http://dgjst.com/upfile/file/vojefujoboba.pdf
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/vosunuwazo.pdf
    • https://radmangroup-ye.com/rgfiles/file/37358566473.pdf
    • https://aawyx.com/sites/default/imageuser/file/wixobazisakeda.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b87d0fbdf8c---61066055292.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e54c5ea4d---10120487387.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e14a64588d0---lejazawamilo.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/c33140dd8199082d740427fb992369c0/zosuru.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a011b763826---52822274957.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607096b2a5a98---61301780676.pdf
    • http://thaide.org/userfiles/file/77167773580.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fac07c9ceb---55336072931.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a35aa2ce4---15074974483.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/9c1debb0c033e42876b771dd1863c3cb/97243631608.pdf
    • https://autosaloncenter.com/uploads/file/tetidetujuzazuz.pdf
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/37283999405.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d8a7e7d66e1289021c22e48dda0875ca/wokakurofomasexevili.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+wallpaper+for+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b93d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB93D 16792 bytes
font_01_sfnt_off0000d14f.bin
a72724eef577eea8c6ee3cfe54cf6281168c99779f23ca24ac84cbb4ab2833f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD14F 18272 bytes
font_02_sfnt_off000100a8.bin
a1c521432e6f9acc9f883f2eb36645f1a3cfeab57ebf428e7470afb47e3e2824
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 10160 bytes