Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b59dcd922fbd2e3…

MALICIOUS

PDF

115.6 KB Created: 2021-06-28 07:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 44247f2fac21b1f0ede136a3abbd6933 SHA-1: 47cb346a0a8ccb8bf2e74b16ffee030d86585c6d SHA-256: 0b59dcd922fbd2e31e9e6a3914bd7b0ea15259491f118521ae1488800721a0ca
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which in turn host further PDF files. This suggests a multi-stage attack, likely for phishing or malware distribution, leveraging compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/9fb1000c393b4ced46b40c484b99c036/18337683787.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d43f1bf68aaddc2076cb0de19509c3da/29581885368.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/08d207b870b135f19431f193a1a450fe/jumesebiwobaruwitimat.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/jejetakadijunewudazi.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9497piojjlfa6c71pqi32t1t27/xawev.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/h79httqg9llkpe35024j1nuef0/53918397011.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/zufekiwoxedobukumulubasu.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/64dc3e58806b1808ba6a4990ece3fa2d/gutatabe.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/o40uct5c8f4qlkobope93e6c5v/fodelipulizor.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607033b218161---zuzovelekeluz.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/xajosewugofegivorimifav.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6ba65238f---93591040717.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/echi5p7n84hlv5haj5e6vd3o87/49393425105.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b892b637937---takepenoxomakopupebava.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160751c62b4729---76274451728.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/16496526934.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/544364828.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/bekevugipawaluf.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/dopepikedabeditapuzuget.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/64273510705.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/cb77f73f2d7f30115591cc5f2f227eee/jolixagugotinapatid.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/16749416057.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d001bceaf589c97e308e7b107cebb644/46246031062.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/43747993666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=i+want+some+cheeseburgers+just+to+eatPDF 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_off00015f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17780 18356 bytes
SHA-256: d2897a5aa5342b63acd8617100a90b951be14dcaecac25ee6b4f92ad2041950d
font_02_sfnt_off0001a779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A779 10948 bytes
SHA-256: 050f15f9c22b923b85e8d76af951a2ffed567feb9c8469d45c7b966d6dc4bdcf

Open this report in the interactive analyzer, or submit your own file for analysis.