Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8aa9de1d6b5a38c…

MALICIOUS

PDF

80.9 KB Created: 2021-07-20 22:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e91d10c5b858df290eac019228d7437f SHA-1: 157a39374eb896a30e9f369a02b030df59b5585c SHA-256: a8aa9de1d6b5a38c4a9265d93150759908cc4683ec13f0262cbe49f69b9c626c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to lure users into downloading further malicious content or to exploit vulnerabilities through these links. The presence of numerous unknown URLs indicates a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/36819578183.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ro2dipglpqn2br3gk224ka35fc/58736022108.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/sunakezedokuveturut.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b35f615f211---jenajute.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/prmviji5mkhgi5n6qjus2841o7/85607090195.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d4a6a94e7bd2448996f00bec2259d986/mexabofatovil.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/nodebiwalukiz.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/dc65eb178591e24fd84836943a0f63bd/12119583342.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/32366626277.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/giludazivubugatunetimal.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4966d6d7---xuzepubutazukosowakorofo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2d5d6e654f95665bf2f0e3a8a3f23724/53194948772.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/138929317be642c36a4e4e7577a8b9f8/48340848083.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa095c0a4---45029215519.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210511071113.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/21480423092.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/wazetofapomiwepafil.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/6u36q849nse90o4m1knqli4lu6/35986063855.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec844ba650---xopero.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/pebemuz.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3f9b9515---kigoregebosada.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210527204258.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/51401602967.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/32815976403.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/lajiwomeravesekepofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=division+story+sums+for+class+3PDF 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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 16528 bytes
SHA-256: 6b6f6b1b43ffbdc05eac62c601130b17624300c7dc560140d889d5a29d37a424
font_01_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 10820 bytes
SHA-256: 8731f3697f7da574f2298fd9d05746150582fd2f74d19171ae44808216e5ff66
font_02_sfnt_off00011c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1