Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26164056e85d0c8…

MALICIOUS

PDF

88.8 KB Created: 2021-09-07 19:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 13587e6e892ec13016e7b44a3f93305e SHA-1: b221ef215f7d7d8f5a7f705a42b56fe04cc57cb7 SHA-256: a26164056e85d0c8c6a612161ff450972883dba1095ed9cd9a055805b70fe4cc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms on compromised CMS uploads indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8622fd7297---sefinewulesanadifo.pdf In PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe64ac0dc54---31602238077.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/66682288057.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/77062213421.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/51364175852.pdfIn PDF document text
    • http://peak-experience-japan.com/mejof.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/monimubiwonida.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/50606417447.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/muwefafose.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843368aed30---1104849125.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/eqo8c59rufjf84uoovg96k70cm/tajidizoba.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/62428168254.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/tujizolawoxewuve.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/bulekalujibid.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/870405a6260570de1b6197f85146d845/funazebuxegavizogobiku.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f2790e35b15---womusizoji.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/pitel.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1407237260adf9cb3ca698cec89b3399/logusotafigapos.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/kavatogenuxe.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/4974fe21e9d3df27d1212988bc24bcce/katevovazudajoguxomed.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/filerikusogivakozogaru.pdfIn PDF document text
    • http://altinay-law.com/images/file/70758201064.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d1cc52976---jumumazabajoviliv.pdfIn PDF document text
    • https://limadelimon.com/images/file/68833998970.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/77684566339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=world+war+1+major+battles+and+events+worksheet+answersPDF 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_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 10980 bytes
SHA-256: 21fd62de4dcf7127dd7474da150eceb850d54a8561370ffefafd64334983540f
font_01_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 17256 bytes
SHA-256: 6dc1a566d76595d6bbc7ed1936559e0ea9348b601dd26ffc6d66a814447f6734