Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec88b360a0e54c05…

MALICIOUS

PDF

88.2 KB Created: 2021-09-16 11:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f324aac2c041619832cfcbd5a33d00b SHA-1: e55d6b8c0fb42944e370d7d3c27ed59863b0d3ff SHA-256: ec88b360a0e54c05bffe41c91c41ee366fe400451c861ba81b28fb7307b1afc3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to distribute malicious content or conduct phishing operations.

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://sapientgenerator.ru/files/userfiles/files/56405993382.pdf In PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/sowixidalepafumil.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/kobajosojemupo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7b096kutk5fmret60kb3fmsu04/wewowogupolim.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/fetiwovogupuvorozo.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/busorakivurinexobin.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/83841723676.pdfIn PDF document text
    • http://indexone.ru/upload/file/46813643700.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/89629882562.pdfIn PDF document text
    • http://houselandia.ru/files/85195109496.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/mavopibofomuxinawapekud.pdfIn PDF document text
    • http://bastola.org/userfiles/file/72198496007.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/ratusipojegunovenobokugur.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/kosaxa.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/digugovejulifiluvomomilob.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/26470153674.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210906131119.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/49467486973.pdfIn PDF document text
    • https://allianztc.ro/files/file/65490252588.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161398bf03e247---tigeletuzuwitugogufogot.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a9893e6e---62263944302.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/movewinuleromedulekedarob.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c547111271---fazutavesulipesobivonab.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/26249698280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=a+first+course+in+abstract+algebraPDF 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_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 10732 bytes
SHA-256: 4241a789acf8dffad52f63f262e662462d016547d5609cd6f05f899916d1ba58
font_01_sfnt_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 19008 bytes
SHA-256: 9658a1d5bf424a4f133639000e519661e371913aeeb07990006f046db10e8df5

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