Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59fb2fd0af648b5…

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 18:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5295f912fe94e9ee8af11fd8f6e2e81 SHA-1: 4d09026e6936e4e17a391c90a23ad9e97e792485 SHA-256: f59fb2fd0af648b56a67ce4ff7be522d5abb6719c4ca85ba2321d7515040eca7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The presence of JavaScript suggests an attempt to execute code, likely to facilitate further malicious activity or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eska-lift.ru/userfiles/file/sidutonolu.pdf In PDF document text
    • http://krevue.cz/UserFiles/File/41177926977.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/jozax.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/mizitimumin.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/51018998333.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/96639936880.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/45b6ce79fdcb48c001d64b5f5286f63c/koxagezotemezudoluxukidid.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/betuji.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130072a48ccb---jobovukarevafekixi.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/75288011904.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/wagaguxitutemejepebogef.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/78053375616.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/barapal.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/josadezubefawalemenaziren.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/57190149126.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/soxokufokiberalaz.pdfIn PDF document text
    • https://podimercrm.com/img/files/tamememif.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/16073653107.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/wanodevefipufas.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/ruwakeji.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/xuwusiwilomezi.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/83356393519.pdfIn PDF document text
    • https://gdaniec.com/upload/files/17941721998.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/0ttq0trp9on8nj8b3p21abu49b/xigulemupunabitisokotalan.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/mafijojozijizeberowino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=slotomania+coins+hackPDF 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_off0000b829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB829 17800 bytes
SHA-256: ca411a014a56818ca16da7b609ca3111c5af3d6e658445852dd72dab97ca5124
font_01_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 10432 bytes
SHA-256: 851b3c25e84c2302b716c7b8d00417b602ed718ac63d0669a1a30319a3169028
font_02_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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