Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16de562f0bba3a6…

MALICIOUS

PDF

87.0 KB Created: 2021-07-21 13:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb44214f732e8b40493f1507cd3b648d SHA-1: 0e4ba0773e599c149de6e77f5bf426338402a203 SHA-256: f16de562f0bba3a655a8ff4b71881d6a0da66d1dd48c21df56f75c866645da5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a likely phishing or SEO manipulation campaign. ClamAV detection and ML classification strongly suggest malicious intent, classifying it as a phishing trojan. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seoulsquare.com/userfiles/file/64603263441.pdf In PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ca48240c80c298998deeca971006c0af/87837265552.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160869759a0e86---mewajipopatawikemeb.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9568d7fcb8---67321463673.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa5acb317---tusive.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0000e2254---1718179872.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f0260d5d8---42556259640.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/jozabezuwuzufoberiwujetok.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vup8i0k5k3t6c2m8fvjvnhaa24/dixomukomepunake.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ec6762be---22709846516.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/masikupozavel.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb03de3a2a---tezolob.pdfIn PDF document text
    • http://teresachild.com/upload/files/83000102560.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/kelowak.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/cc0d4acec6bfc9339183afa88740062d/50574071076.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/baluxijesukikorumora.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4b3dadc7f4b8bd0cf96afc5f0801fcef/51756544454.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0b20a0349b79df9c133a16a3e0bd30a1/3024541623.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f6204f51b6cd4caa11702be617c1bf6a/fosapaviwufofarumomibi.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/dividezudumoxijezud.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160914c96dd891---lenoditubune.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/32b692b5acf30ed58147e5c878d9b907/gotezu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/78441ac00e22b1931d1df94b5c903b5d/lobumenetelobinadaxesij.pdfIn PDF document text
    • https://incasur.org/temp//files/88917225379.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/26996657090.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/dp61farup1nar0hcal23jgnjp5/senafajidu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1c70ea089be652208a907d5e0678ce02/zuderuwujumukoreta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=where+are+pdfs+saved+on+iphonePDF 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_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 16616 bytes
SHA-256: 9dcb3f259f486cb37fcd43dd4e3e0d45b981c19d270d434e47fd06ed097c4106
font_02_sfnt_off00013682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13682 10508 bytes
SHA-256: 677c99fc479472b18d7bb1c2d98e681c53eaebc0ba81ffa920ce8c08e5f49f34

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