Malicious PDF — malware analysis report

Static analysis result for SHA-256 df274652fd3815c7…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 03:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2a33f421594ac249d8a99b9a6685c9ea SHA-1: 1f27a9a1a117d50dbd8b694126b9e83b3eec9309 SHA-256: df274652fd3815c75d4db53e2fc24714155e5a909b66e28adb3a4cde3d7b403d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing and trojan payload. Heuristics indicate embedded JavaScript and a link farm pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to download malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alexlunacoach.com/img/editor/file/47685601827.pdf In PDF document text
    • http://deleersnijder-bocaege.be/images/file/96497230743.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/femudodafisulumokofikive.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/87233009114.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/gisijomefud.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/rasodovovujojaliveduxirik.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/88727080621.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161324d33614b9---verozegi.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/73299245923.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/79331248331.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/26930207083.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451faa2fefb---9630816723.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/xopuvotuzulomuvapoxuz.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/fexofijikeleziwimow.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/varumotarefako.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/zovep.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/64886298990.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/felelapomifo.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/25309449991.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/39322779848.pdfIn PDF document text
    • http://client.diffuse.info/files/17564255804.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/u7ule7eot5t7636978u8g7rh82/mezarodiridizomik.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/welugifem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=let%27s+go+pikachu+apk+no+verificationPDF 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_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 17928 bytes
SHA-256: 3ac2811b720286f1000599c3251e34fd71a81b15b3f92bdd9933373283ad1edc
font_01_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 10964 bytes
SHA-256: 2cc911f50ac79ad8b3c1b39f638861e3ef6a2d8790d557bf2ac653276c1e99eb
font_02_sfnt_off00011adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1