Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b9cd2803937bae…

MALICIOUS

PDF

93.5 KB Created: 2021-07-31 12:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94e7172f802f64da89fe24ee1056d35e SHA-1: 5f1e63b6a1e650230282bef2c48ac4a32551bd1a SHA-256: f5b9cd2803937bae37dd9d29dcb8fa54458f8f1afb9f374db3e4532bcfc5ec78
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it is used to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=a+cuantos+centimetros+cubicos+equivale+50+mililitros PDF link annotation
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/7656480937428762d782bf83feaeaf47/dibupav.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/luvazidimibemelorofu.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/66468931139.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16228397139164.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/snm7biss6sjbar7d34tabb39n8/wobamolakebelujopopevega.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a413c52b3---tipotisokowedene.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/93fmsojmvn3hbnvcfjes135ch2/89087924412.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/q4qhc1kjcm05elchc37gih905q/sifezofavizev.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/18351425518.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1d0f6976cb97062ab9590f4799d60f49/11011272386.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/wewoxawinav.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f58effce---wujabimobemonupaju.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607828e3e9a67---kilapikikotas.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/lowavananufa.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839e80bcdb1---96053199022.pdfIn PDF document text
    • http://schokobrunnen.com/idata/77278192261.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/donaxilorofupateweg.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/29029224195.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb62899adc---89319863599.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xilifubugodo.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_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 18896 bytes
SHA-256: 49a41bb88e66ebbcd2769d06726ed9c7e0fae9abef2e01a23687bb85e39a1e20
font_01_sfnt_off00013403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1A 11080 bytes
SHA-256: 85767df4b4b31dce8efdb0f3929516605cd080f0c185628f2ef3a75a67d77abb

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