Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f4ec254bb54da3…

MALICIOUS

PDF

88.0 KB Created: 2021-07-18 17:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e1fd90ae048db483256df281a8bfdd4f SHA-1: 60da347e77246d54f680660eecad65ad15f64143 SHA-256: 12f4ec254bb54da32ebe5dd3a8a8adaec9457bd494d56823ee8b4a97c9a88af3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of multiple links on potentially compromised CMS uploads suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://tubietelbar.hu/uploadfile/50521317230.pdf In PDF document text
    • http://actlogistic.vn/upload/editor/files/kolemiforigaramonebapad.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/26907741670.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/83998461178.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fnc8lemng3si64f3palg9lkvpl/kowaki.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/mugifejivesaz.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/sedamirigivasapegosujo.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/rubebenosowepilat.pdfIn PDF document text
    • http://atya.eu/files/file/femig.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098139aebc82---vubanabaxiwikukuzijira.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/36200188524.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/29188257567.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc676d5ac---runadezekit.pdfIn PDF document text
    • https://arerp.kr/data/file///99568396850.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c99c1422f---65683583724.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/6299149744.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/9720325881.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/xepejonegexubunakoje.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/fuxoxurako.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/pexoxiwewavagivizaxub.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/42052851926.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c585cb025---56733942074.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826cb65b555---vamijibovibelezuke.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722a9cb55d9---10658470033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=free+fire+mod+apk+download+new+versionPDF 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_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 10784 bytes
SHA-256: 2db9d83d614f749256c417bbd7ec6f3d08487762f7cad07bafccc8a6655e4f68
font_01_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 19456 bytes
SHA-256: 8db8999e1eab5684330093d0a49a67c5c9d8ab1493e3955ddec2e5438a1927e5
font_02_sfnt_off00013a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1