Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcd454cd8ced031…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 10:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7c1c14ced50c46d281f49d6dc38cb2eb SHA-1: 1f6fea70c51b4bee0576125c690a5dd6f8c0b347 SHA-256: 0bcd454cd8ced0313819d5c975ed36def4301e8552988abc08a496f36b2c31c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely as part of a phishing campaign to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137e34772cd6---99722546318.pdf In PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/renuwubo.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/puwugikafemepugunepe.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///pogorutafalalogilefudano.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/gufarapeborerumasik.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/xaxejunetodumuzil.pdfIn PDF document text
    • https://taperagi.com/contents/files/lezuf.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/97489991712.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136958fbae3c---fevukizofufabenilu.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/11869144862.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/tanaloxon.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/wotugorazadidasejozamuke.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/febakina.pdfIn PDF document text
    • https://mashura.co/userfiles/files/jisimipebotunan.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/30020492921.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134a77cdcd42---levuzipowolikekudo.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/96578229080.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/nanerefirena.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/br5gqe0h956m10jthpkt9a1bc6/wewakeg.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/vadakojanixurosanaguw.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134befd54c13---8753008682.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/xegujile.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/96056972023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+java+edition+free+download+for+android+mobilePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d3fe0296---bapiturelajikekazenozin.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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 18024 bytes
SHA-256: 735b7bb5e70cda60ba6a826dbb73d025f80b4facb76e08cb4daa432e70c14888
font_01_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 10884 bytes
SHA-256: 72d2c627497793a76c7716f6e97acd3d2130b56588a2900a9a02bbc6346b7162

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