Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2b621ef4906f1c…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 03:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed0117933b5a3cceb1ddc1ce36a2d9be SHA-1: 0767b5878228b479db894a41634a77e9bfe8a977 SHA-256: da2b621ef4906f1c8b7c3dfbd800aef4fc898f2aa396874dccad2a07d6656b7c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further supporting its use as a deceptive container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396847125f6---7184222158.pdf
    • http://teamtrinity.net/trinitya/file/83300212243.pdf
    • http://bige.vn/uploads/userfiles/file/54632667874.pdf
    • http://samtekelektrik.com/files/nevixusifonul.pdf
    • http://alarmy-kamery24.pl/userfiles/file/paxipetizejemiwojuruvuton.pdf
    • http://buren-kompanie.de/userfiles/files/62952696483.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pdbi2tlctol0quhohvuld8gff4/68113603627.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1232e0047---71255653839.pdf
    • http://dlzhrjd.com/images/uploadfile/files/83233537220.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7df306bd---44402946766.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161443ab22e82d---dafojisirovinuleduxab.pdf
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/fovumixu.pdf
    • https://quote-supermarket.com/userfiles/file/44725121501.pdf
    • http://thebookmarkcafe.com/uploads/files/22965009627.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309919d1129---gegemexufefi.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/91129885689.pdf
    • https://serihosting.com/calisma2/files/uploads/pebokedomuwejomasofudus.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ba40203f6dfe7daec57a5bf414f39c10/fisazoxor.pdf
    • http://macro-e.com/app/webroot/userfiles/files/lemugo.pdf
    • http://makeyourpartnermelt.com/userfiles/file/nirijafuxibajalesal.pdf
    • http://trustarshida.co/cache/fck_files/file/39200845176.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/fl26g0krd6klgvumk6i3kcf1v6/58142731492.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=terminator+dark+fate+full+movie
    • 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_off0000af35.bin
9fb5059258e0adfa71b589d7a3119b4dae0f757fae613d9469e41f1696a47d63
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF35 14356 bytes
font_01_sfnt_off0000d2e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 16792 bytes
font_02_sfnt_off0000eafc.bin
9835baa1bd4a22c3e205c7a7a64a92fdc35d14083016a7405a6654630bdbb298
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 10568 bytes