Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f8ddbec1ff0e88…

MALICIOUS

PDF

120.5 KB Created: 2021-09-06 21:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fa92bc856f6c72042e6fe8cd474ff8d9 SHA-1: 0e8d4c8fd0f6a3d2eb1e82acfcdb09fe19546f8a SHA-256: 15f8ddbec1ff0e88286271b452126630d97ef536fe3f54808a5ce81de40689ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. The presence of embedded JS and external URIs aligns with techniques used for initial access and command and scripting interpretation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pmfegypt.com/userfiles/files/wojedimojosu.pdf In PDF document text
    • http://tycoonmedical.com/userfiles/file/wuxivaluretofoxa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b9483cc53ab---14583682491.pdfIn PDF document text
    • http://liily.jp/upload/file/20210723003348.pdfIn PDF document text
    • https://chp-travel.ir/data/file/33199780709.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608995a3d1996---46910750552.pdfIn PDF document text
    • http://learningkey.org/userfiles/kikugegobolerixirebimus.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021061914445173499.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/56620735234.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/68839538002.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/kpnno8j4ssorp27nvjulk5ut47/3400441059.pdfIn PDF document text
    • https://electroagro.es/pub/files/553732776.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9e0443de0---zisetutozig.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/95d0ea9a8002c71156daa89c332ec2a6/20114187085.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/bs5lai75g0bl9caa1r799anjl1/54655335141.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf76a3a354---64969350429.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/sexigejufepodabukopupib.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff826ece720---xokijomirenuxogudo.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210511222035.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/28710163188.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/73891671490.pdfIn PDF document text
    • http://obermeyer-modemarkt.de/upload/file/46707194586.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/83adcb185f8702a2294675cf2846cae2/kenojir.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/95145662375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cahills+vs+vespers+trust+no+one+pdfPDF 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_off00016fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBA 19528 bytes
SHA-256: 576920d612ea92395dd336cd6a06d15c43c3a5456c0c1d2dad225b9376334884
font_01_sfnt_off0001a2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2D5 10792 bytes
SHA-256: d69e380c34287bca14c2254527cd1ddcd41fc69ed0158bc3ccf63aadad20a8bc
font_02_sfnt_off0001bbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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