Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a82ff59eacca19…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 04:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d5bd5be91c22a19cd9fc412e98a37aa9 SHA-1: 7233caf8eebd485336e23e54eb673e96fb838976 SHA-256: 83a82ff59eacca195517a330f143d26545db762b398549730db96d94b35b4744
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 classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=rfs+real+flight+simulator+apk PDF link annotation
    • http://timebymtm.com/upload/files/91483125386.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210915170221119088.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136775ed8e12---51888310975.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/79130285196.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/23217193648.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/sapaxosikemokib.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/66139466480.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/59225693911.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/36005463270.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/22748252211.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/nifawaboniditanekunajijad.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/68282548931.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb7ce6e71---42783629880.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/27115493468.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/wavolimemunimiruxuti.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/zoxajuzakemapanixagus.pdfIn PDF document text
    • https://onlinendttraining.com/files/mamezemavu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/wakeperemafepuregexam.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/rurutixemibirufowos.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/73714778811.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/romivukagimusepa.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a265475a4---35443855396.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/xubis.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/kifomofekomuviv.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_off0000cc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 10940 bytes
SHA-256: cb80cd43f7080032fb71821f0f05f145ea0d4c16beb74d9a8945beb55cc0461c
font_02_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 16924 bytes
SHA-256: 2aa1946f51d944e4ce43b07c3e688ca951e5ec9593bf2a0637e22bb04df3e75d

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