Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03be53e4544ffbf…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 14:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f96eb70b6e2149fb999d7aff6bfa7dbd SHA-1: ecbba468fececf275d5161ae7b04cca169cdfb0e SHA-256: b03be53e4544ffbfc85115faff510b6fcd8aa8dc9727b98441a86ab318a33f28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://laborke.ru/uplcv?utm_term=tertullian+de+anima+pdf PDF link annotation
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/cea50a15b14d89ac9170354f4781e383/33780549736.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/rirukapujedoxevinalofas.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/75da6da57b13794df56c77bca2f8b611/fisufizuzagokufafugakilid.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607813863ce8b---bosepebux.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/patavuxajo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8354dbc3f2507da3b1bfbf23d98d30c4/ropavusazatolapu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16089c53d8f384---resela.pdfIn PDF document text
    • http://talleresjpg.es/img/file/mexiduvowalasa.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e90f494f1---20630850343.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/92708966038.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/subot.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/78503573081.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/78823745542.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54c294dfdb12f2bb40f962e3783783ff/1610825659.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2a2a404573db1b4a7a191de49490dc44/senezepiw.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098d6c9d10e5---xiridepumotu.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/nesufov.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/171549127593.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qnj9tc45gg2muggrgirbsva177/47204620788.pdfIn PDF document text
    • https://eguiders.com/uploads/96323509772.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/522d761921701319baeff440745f68c6/gazonebew.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/43905097556.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/josukelifalifa.pdfIn PDF document text
    • http://apsons.eu/files/file/xulimegawad.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/birovorabobon.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/kotololuzejexeta.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_off0000bec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC0 20404 bytes
SHA-256: 21358a8a9604e60b7b00d427ef005239b5ed33e80a17469379811e6e5487fbc9
font_01_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 10432 bytes
SHA-256: 320f249931bb21d16a57ce158f6c6a1cf3c92d9bc520fa0d5005f6e35909311b

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