Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb1bb2a1149595d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 00:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 152571f7ce26062f39ee37fc0e7144cc SHA-1: 170f4bd4ea95d3931535dfff5d91c5db5c4e0703 SHA-256: ebb1bb2a1149595d698b8de32cadace543a40ff428c743a1d48acb2a1e98ae92
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607293c88e746---joxes.pdf In PDF document text
    • http://itkaufmann.com/images/fckimages/file/libezadotipitovasiduloni.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a238ac86d05---rananegemuje.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/54899286626.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d2fc38a1e0d21da20ee0b156ae796351/musavifixo.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/79135374496.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/13772bc3a8739b842dc5de4e3909b38d/84459413102.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c3bdee50---35279474118.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/40798542953.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/62544379506.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/c1lg89vbg6dcvp09i0rloo36pp/rapotojasajudazaw.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c89a59662c---94494075181.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b0a049dd023c2581b77720263f7cdf75/2298937326.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/75335307337.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/71378265988.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160864daaf2599---97714651326.pdfIn PDF document text
    • https://anjingliar.com/contents//files/bosewibasemogukunugolabob.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/79107622627.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/45212560398.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/vmu8m2qbl5912f66mns01eouo7/kewif.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pasepofevogijavimometuneg.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/58190700729.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e867b79ae---7682130452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=plot+structure+worksheetPDF 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_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 17708 bytes
SHA-256: 37d034e792a894b36db50c901f27bc21d7ac064caf23adf3c4b87e840752d468
font_01_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 10248 bytes
SHA-256: 5b517cfc5116bb30c193ffc6e8406bb41cafe31e3e1108ad500f41b307302f6c

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