Malicious PDF — malware analysis report

Static analysis result for SHA-256 051edadf62f9a1b3…

MALICIOUS

PDF

108.2 KB Created: 2021-08-19 03:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4675c9c1e9922e13ed055ea76879a17 SHA-1: 050d837c6498a2792cdb39ee5cdc71d569db11ea SHA-256: 051edadf62f9a1b35242f5f1362dfa36c8fdda453b6387c2f5f640c3d864ff23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs, though some are marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://palestraarkadia.it/userfiles/files/15892113891.pdf In PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/632244950.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/r3l1qmskj25a8amo3qfcj63moc/21427749050.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/a48713a5a97eae35c6f09e6e240d681d/kojalomozigolijur.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/39300512044.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/94330565dbe365d01874e92cfdf143a5/80735579681.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/38598102697.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161074e16dd87d---62326182772.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/83baf55e72ec5ec96f591a44a86ab527/ferekonevazufodutiva.pdfIn PDF document text
    • https://apra.pl/files/file/bulaxiwamosakokosela.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/98971497414.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/s2aaefuhuf1l6inujos5vu74u6/jotam.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb0b21c72---34275972129.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/xelifagafakenigidugun.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875bbed3de8---tebegidipujugixa.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2289dfaff---31830461671.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bonixisupejubefamuxuzo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8778c19d7a---18451873140.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/xojavik.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/zusizituvamidumolurovi.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/8340515286.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2db883a47---givapozonefufi.pdfIn PDF document text
    • http://cartopack.com/Images/file/3180931484.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c03a453076d---wuvasusetafaguxuvuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=apple+watch+series+5+gps+44mm+price+in+indiaPDF 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_off000140ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000158bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BF 17800 bytes
SHA-256: 96f1e9bd5b29378dc010236660c9cca4656bebc8cb2156ab2f2dafef6c3c6cd4
font_02_sfnt_off000186c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186C1 11120 bytes
SHA-256: 0eac9d87f883d3da8762e38bed9a1867f84f8ef0868184a816053bb5d8d29845