Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51bdedace371737…

MALICIOUS

PDF

85.3 KB Created: 2021-08-25 09:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 12507552cd95e9ec234ee874f2f7b4e5 SHA-1: 63fa6126202605670a30db24a2115b2a4090133c SHA-256: f51bdedace371737d25d0f81bb7a101a78c6580eb000c8a00e54543bda7c303d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of links, many pointing to PDFs hosted on potentially compromised CMS upload directories or disposable hosting. The primary function appears to be acting as a link farm, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://tasteofruraleurope.eu/upload/File/32539373897.pdf In PDF document text
    • http://poltinka.ru/userfiles/file/62619330894.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/69066465255.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/wesababovutonozulibabeb.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160826d8ee6ad3---86346291629.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/napiv.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd07dc5f0---mesumexidelutiferaberurun.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/nilirimijofekaribavelinu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b15276a5cf8ff99765124ea1730886fe/74056707364.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///soterepetuminepulaji.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/59789406787.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/73158535106.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/difakujidedudabafezelalo.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/79241572554.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/75215434799.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/2bpuuta2fk954ofcp0f76nhpj5/81886773806.pdfIn PDF document text
    • http://veitali.com/upload/files/saketufosifekisubeg.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afccec62b26---23850206645.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210714_A8CF8CD5F6C3E5B2.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rajenevafiwotakat.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/99936232793.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/25696520670.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/6228f01266619568adba13e69413ff4e/35913802985.pdfIn PDF document text
    • http://ahchala.com/img/file/judemuvufimorijuzeguvid.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f064ca64---vutorikizovorowemu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/jesolotesadilavuwiram.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612012740840a---zudorabopewuforobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+road+home+sheet+musicPDF 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_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 10548 bytes
SHA-256: e3252afca6cfc8b4a1d08ad058798519d2fde1cb2e2dacc44c00464442a1e6fa
font_01_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 16828 bytes
SHA-256: 88f8401ab694299db5036ea2b874276e38ef62ee54803e2b7481867449bbe8b9
font_02_sfnt_off00012e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1