Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2e99bbb1c6cde3…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 02:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e698e8355053ac945188f7dca1cf5f8c SHA-1: 2d1dc50f2a24f531d3006fde16414370fbf41462 SHA-256: 0c2e99bbb1c6cde3c699c93bafda0eee16e1e2ee9490194dc819c71f1a45682d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload locations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sonsuadogo.org/Images_upload/files/nejevebuzewarofukuxusoju.pdf In PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/kuroe3059g9recrjbt6t3k7ean/65176296589.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a5344b9c9---gonuforikaxegirunejuruk.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/be8677f922a0a8946c74140035cf985c/putimalilujidubazaxepika.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/d3a3319e74623fa06a8567b9ca48d26b/tuzilinex.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/67694f44173c491e91abf06bc5322418/8436645377.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kadovagu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16084eeb38b092---93810644897.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/13052089185.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/43393108777.pdfIn PDF document text
    • http://afro-safari.com/upload/files/dudodimavat.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/48700537427.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ae43a8f4e78c5a53bbbb3a3450433d51/patesigijevakovesadujot.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/pidetelasubetopax.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/nerepena.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/81184e429666e5f5dbc7a84770c18df4/koxebilelakifuse.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d621b01038bc35a7d14d25ac51f01a7a/29289329557.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/nmdhbfd9shitsikrjo2t2f1at9/lavikivinamejidozivusotu.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/78044673911.pdfIn PDF document text
    • https://digireg.gr/upload/57022025999.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607112706cd68---53156018005.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/17893585006.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/gasifugipowuwa.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/82624034539.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4da4c2f0f---fapisujuwubizewudizulug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=crime+thriller+hollywood+movies+in+tamilPDF 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_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 10812 bytes
SHA-256: a4756a0cd424f4f4e9a4c216166e3bcf2577ea090dab439c8c807d151a26e474
font_02_sfnt_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 18208 bytes
SHA-256: 9fc0a2140184894d14c9ae56f4756785d705b689edc8e72b331574087e0bbea2

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