Malicious PDF — malware analysis report

Static analysis result for SHA-256 8277ff59bb46c1c7…

MALICIOUS

PDF

119.3 KB Created: 2021-07-25 19:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ec211b56a11b6f43df67cc1a8c0d491c SHA-1: df66ade30c7eedb283d1f8708236e641a8677af0 SHA-256: 8277ff59bb46c1c70a12c3cc26bd243b6d0dd6b2558fb2c0eec9e8ae43fe02a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://www.vikingmaterials.com/img/48621775481.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160825b1120e0b---98834664523.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf769ddf75---kenebepaliv.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/ketovuzarinozimamago.pdfIn PDF document text
    • http://blueyee.com/upload/file/15134325897.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f16231b003cc6bbc1e41054a03fab566/vafogopopazebige.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892e45d6521---kovaxekusabekepim.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1abfd97d1---vapabawe.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/mulam.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gemub.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/2518285819.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/zotokejij.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/16028572912.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/sifizonagatusuguwarudib.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c215cf454a8d7092de85fc1088f7fad9/37780411818.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/32f961fda9aafcdaca2d5ab79bec5057/kilemivijumogivapu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd6d3b842e---24011973743.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/pipamebatizopepefinuzin.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ugbf2ps6003g5cipu2mb0a8d01/19991237792.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2a59de1c7ca953eb13704c92951f029a/75466431963.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/dc7cf41a7a772f2e62d3d768fb3565eb/rotugukani.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/59995641081.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/nupali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=new+super+mario+bros+wii+all+star+coins+world+2PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/546e4c1c12651c65d0792614a835ecd3/gurafowakiguxadiziwez.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC5 18632 bytes
SHA-256: dd93a7ddb636f69d8dcf603d0e94cd8e6a73b910d11861926bb0f13de75fd516
font_01_sfnt_off00018bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BB3 4028 bytes
SHA-256: 93837e3f467dd5e494ea6389e76a770f111a173d23bcf00610db524169418dcb
font_02_sfnt_off00019b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B38C 11100 bytes
SHA-256: bd531222ac5a57990f0c1ec6b1c505fc39802252ff734287f16616c2e83c21b7