Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3bde123cfa4ce1…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 23:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7b7d85168ee2c03f19b5a87dc6c779b8 SHA-1: 161334568b5c6dc997516b873efc444636594dbd SHA-256: cb3bde123cfa4ce1cfe347836aee587c6f6a0a957ded3a196bbebf2fa0e804bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of PDF link farm heuristics and external URI firings points to an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/96fb72843376b560eb725a88b74c3486/71379323124.pdf In PDF document text
    • https://bisnismedsos.com/userfiles/file/99708117601.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/27537169476.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c890c54a0299f876641433703c57079a/derumevojikenenare.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eacdee4d3---42030963451.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/kimoroko.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/saruvaxasusa.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/0gifjigp7gpgeim7s8ki6ir5t8/rusojipubafigogedu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e24c07ecc---34895652302.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1f3ebcf32---nekazozujujuguzaxovop.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/8d472fa8864af801fa99798b7aeaaab7/58942775210.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/86726459386.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e5ba7bb8272108446fe69b52d7511d90/70336980165.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084f07c9cbbf---vomosezoziwozebuberopatuk.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/65624631761.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/5167227098.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/91c5da44d0aa61d52046eb4a2a9392da/xuzidukejeto.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/c55bov8s0rb2thej4l06gl5a46/2448648414.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a4c5044bb4815076b0089fa4af3cdaa3/17592355068.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/zesisularexavosedowumud.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/manoganunu.pdfIn PDF document text
    • http://carszana.com/image/upload/File/75453324192.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/palaxefubilabazafasuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=vehicle+bill+of+sale+template+ontarioPDF 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_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 10856 bytes
SHA-256: 1b9fbd1f1690af24fcec6861a797e15a8ff080bd7f3f7fa3df1977849864ea4a
font_01_sfnt_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 17116 bytes
SHA-256: 788c05279b442ececfbc33ea121e536c2b621df9bbc7c50b67d45cabb76a57c1
font_02_sfnt_off00013470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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