Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c870bf9c857365c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 13:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1edb1d3a73b8246771f816ebe3ada167 SHA-1: 2f6407e98fa3a5ad6e7c660a23281a04a93484c3 SHA-256: 2c870bf9c857365c237522cdc473ea9153cba80002cb0958dc29b75a255d7e38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jnvhardoi.org/ckfinder/userfiles/files/faxobuku.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/57b1a0d10660afece36666c13883c37a/21469893328.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d9dbc126869ab9e1c21ee9fe2354565d/43109515020.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/rerisajikuwomap.pdfIn PDF document text
    • https://motecx.com/images/file/fikegugijavikazizupalefel.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/66449837327.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/dedubefixatowesedito.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46b1a06643---63164058005.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaa77051b8---renasanawobaxalurosojo.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/vafunamesejiwajikamuwedix.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/qcc90g0qrbi1etpd2njj63f0o7/ximapon.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/wunupukewofejoluvudijafa.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/70936162574.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e6acb107---losomodelen.pdfIn PDF document text
    • https://songhong.info/userfiles/file/10016342513.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792724b7918---80171073833.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/navc9fqfqhgu98ijfu9mn4gafp/56976099093.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/7c6d000c99a25ac323ae2468353a3d3a/25304940869.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/51607459015.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/fezoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ptsd+dsm+5+pdfPDF 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_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 17348 bytes
SHA-256: 35ea3a81a97339315156cdc7ba45a3ecc060983503098b9e36341884abda2422
font_01_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238B 10040 bytes
SHA-256: e4d20739985a13f707564a9072bf6f0f7c8406d88be3b738aab730304b59ad1f

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