Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e9457f60b9f390…

MALICIOUS

PDF

87.9 KB Created: 2021-06-30 12:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5108a9f2ab895289ff33fb2744b4e14c SHA-1: a3952eedb4902247efba88cd645f93d5f251cfcb SHA-256: e4e9457f60b9f3903b9dea2a5bca2283b216112ce486c496769dc05912c4deb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://rana-international.com/userfiles/files/bulikivomexemirupizu.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/87066156401.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/qq5a8tlkaviuc9mvc2fu44ut36/77001676823.pdf
    • https://bcbc3399.com/upload/files/nenotutewo.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6983eb5c108320e51a957c8ce1d72cf8/furepaw.pdf
    • http://auto-spec.ca/fck/file/30763852154.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b38a3bb165f---vufub.pdf
    • http://sns-russia.ru/userfiles/file/5123411721.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c28014b00fd6212060346ccbf4ee7292/10293725832.pdf
    • http://falerisztika.hu/tmp/46489741416.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b95de984---miwev.pdf
    • http://solamsys.com/userData/board/file/991751387.pdf
    • http://backkwang.com/userData/board/file/munetasepemozoseko.pdf
    • http://huile-de-nigelle.info/userfiles/file/48978431381.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5a2bf413f---5345360341.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/32f6e7e67156b15db17dee9e31b570f8/14145853713.pdf
    • http://aldara-latinoamerica.com/userfiles/file/12694543931.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b2e60ea03a00de0da3410c4e2c62e20b/nasufi.pdf
    • https://cpsguffanti.com/uploads/file/49410208404.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3a94d9b9---mazajubumosutalumisuro.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d86847262---wuxevulanew.pdf
    • https://zionapostolicministries.org/uploads/file/63346084862.pdf
    • http://aire-limpio.com/img/editor/file/57458236677.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/xamexofomo.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd9e624a87---79503047421.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cable+one+boise+channel+guide
    • 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_off0000f3c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 16792 bytes
font_01_sfnt_off00010bda.bin
088dc96f45a5d848f49897059f9a970cb26c62b6b29fecb3575b3da8ab7285c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 17592 bytes
font_02_sfnt_off000139d2.bin
212bf8871f216ac4c79090f1f229671d939e80fb2d4ce60f80ddc87bfccba910
pdf-font-stream PDF embedded font (sfnt) at offset 0x139D2 10724 bytes