Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5b0cd6c5f5e376…

MALICIOUS

PDF

83.8 KB Created: 2021-07-05 10:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bee851408047cf0bd730c25ed58b32c6 SHA-1: ddcd99e3a1838b04dcd1cfba9ab6563d93c9f98c SHA-256: bd5b0cd6c5f5e3760bfc4159419fa84ef90e39dff6ef41d2ab1f577783d4069e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites and potentially malicious domains, indicating an attempt to redirect users to harmful content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=what+does+lets+vibe+mean
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607140ba7eded---terimobel.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16098e66912abd---51547072249.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/8k308rlsjphn7ocsv673rmcjg0/931476334.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160793946038bb---3488249251.pdf
    • http://feynburg-uhren.de/uploads/zixupovinefiwemetalutifep.pdf
    • http://guoyangmoju.com/userfiles/files/76756319126.pdf
    • http://dongshengcable.com/images/upload/File/10584911600.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a98d5550a5fe2015d8e5cce699c04672/87185029261.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/31ffb332e29085e5d2b26ddbd22d8c4f/42492758692.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/67103505520.pdf
    • http://ecovn.vn/uploads/news_file/zomupapipoponapizumitot.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6dea9de205b956d2bb5bb705758c04fa/ropogerep.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/2417891569.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/86192418524.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e21f5fbf8c2da092cfd226f115df3a33/296902906.pdf
    • https://asset-books.com/userfiles/file/53718423697.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dgu6jvtov3d994h30sq8pmf0kt/64980627221.pdf
    • http://b-solutions.net/userfiles/file/gusiza.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cb56a31d1a3d3fe812e133efd181a777/97078344487.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6fbb0c130f11ca4df0e901ceb2454fca/3299973503.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091287b86278---89744053542.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09e86e351---jigisuvaxedilutevigakej.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/sofawimigekenel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 16792 bytes
font_01_sfnt_off0000fec1.bin
4a8cfb6e40076777fd9acb5c07f4f28a01d78c4d670f49f9e62e914497c093a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 10612 bytes
font_02_sfnt_off000116d2.bin
7fe07697513e4ad07e5591a70b42b1c93e0346861541255eefa62033156d8f10
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 16808 bytes