Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e06b5041283271c…

MALICIOUS

PDF

88.2 KB Created: 2021-08-11 14:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 667942e28ace75f5089421ed615233d9 SHA-1: c086c037c3f3f1faf9d187c8201f695735dfd037 SHA-256: 3e06b5041283271c24f400ce551909aa5e101b3fadaf7a8c68b756698de0f76c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f8a4ae0ea---digajolaxobudevonazej.pdf In PDF document text
    • http://bnblspecialities.com/userfiles/files/18596423648.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3256ee401554f3599f3bfbdb096fda28/69054229773.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f0f10510---97134666278.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/guretudopifepusegizot.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db3d8632046---67012070704.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e6a7d0ac12cd62ef8b5745f4f009d850/20982687245.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b934b2936e9---watokixiverizukig.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1916b7e2042cd6893a60725e80b5c4bd/deluwet.pdfIn PDF document text
    • https://nadamasristorante.it/file/nesanujejabofat.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6dce13933---90268722554.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/tefofil.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01a17ceb78a6ac31e54631ac4d2740b4/7978225029.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/bagabakixumodimululoxogi.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/kenikesesagelasa.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/b3e315u4gutkcjoi1gkoijjh0g/melarowenewiwo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c492bd3b063---toligebewusosuta.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/65369119359.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/devareluxujiginavo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16109a79dd44c8---zutidilomavijirororelaxex.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/21402783682.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/30589099829.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/sifomazegawifim.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/bivujalib.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b86edcc18595d7549f15719e221f3b7e/sajipexugizowamanenipizif.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/kitirutolexesazax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+take+off+activation+lock+on+ipod+touchPDF 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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 17000 bytes
SHA-256: dceb4edfe9997abc18763454145198689061a4e1129ddf817db0e1f1965289d1
font_02_sfnt_off000138a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A4 10784 bytes
SHA-256: 92c2913d0e3ad7bf39ca402f40e083a30b7627ee3e7eef33c51787d86b12b8b3