Malicious PDF — malware analysis report

Static analysis result for SHA-256 537e2e313055d8b1…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 13:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c4d19ebb9468ccb501c2ed67fb75792 SHA-1: 0b14d263b6717af1cce6dfd5bc737d7f53817028 SHA-256: 537e2e313055d8b15f8659eb83621bd5406002ac0aeb618772dddf60d4b0b7ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and heuristics indicate it functions as a link farm, with several pointing to compromised WordPress sites. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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 https://ketchas.ru/uplcv?utm_term=roblox+64+rom+hack PDF link annotation
    • https://maftplayer.net/calisma2/files/uploads/niwaxetadubesubojilag.pdfIn PDF document text
    • http://bienbao.org/uploads/files/48774747242.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/26337649518.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/kanix.pdfIn PDF document text
    • http://juentai.com/userfiles/files/garuwepobukogovaperaluwu.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/niwanerufukitobenuki.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/74096534283.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/bukonodobapil.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9e87f966641a9c4d7316221effff575e/devam.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/sukudipides.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vlfi3uhb3i11t4sadsl5jscgua/45570172077.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/wikolegagotozuboxifap.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/s0253ahn97097kqa0s8s805u35/1226206661.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a57a56f1e---48687140317.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/vifiwirologu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1e1201c46c604b03fc1cae74b73dbd49/ferenafos.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/64640117526.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/73819605993.pdfIn PDF document text
    • https://megashina24.ru/files/files/61635672228.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/42380919849.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/11941051219.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/susotetasub.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/bizolepudivalivom.pdfIn PDF document text
    • 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_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 17128 bytes
SHA-256: 3e1e2d8d94268510030cfe40674153c128846790b48190b3e1e01777a7342819
font_01_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 10524 bytes
SHA-256: 4bfa34cdd98ca250a548a0d7149a5b82db046c33e1ecfc4b0dc8c99c89ad2658
font_02_sfnt_off000119c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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