Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ebda8bb784df91…

MALICIOUS

PDF

90.7 KB Created: 2021-06-27 10:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6075780ce4448c1d592eec8373c987bb SHA-1: 777b73a1ab893be1de5de835e75d0a5c893fbd06 SHA-256: 19ebda8bb784df91943494139b46739a7a2a9a4d4bce5228760ae9c353fba701
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.pattyn360.com/upload/forum/files/gesakokewaxigexalowi.pdf
    • http://metapolar.hu/tmp/86173688991.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e9f460218db4e97f2f3c96b7f07e6280/57978360640.pdf
    • http://inwallendorf.de/userfiles/file/rifapudimaz.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/uok9ecpgualbq0nmm068a6jir5/gomona.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/9umij6n7e3275gij1943a91dk8/36839210193.pdf
    • https://volnynaklad.cz/data/file/62188300214.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bff08ec1e19---7651886982.pdf
    • https://tipresentoio.it/images/file/radepeku.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098dee2896d4---tamawafubulevukovu.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/61613262250.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717e39dce37---66134070520.pdf
    • http://tokstar.com/_UploadFile/Images/file/54561049685.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1deb26be6---34204195476.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a569498f869---lagedamasobakenuparetizo.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd55b25cb4---84972288833.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b327bd0aba7---sudarud.pdf
    • http://seksdagen.nl/userfiles/file/43775164121.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2af8a7233b---46203951509.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0a3a8e7a13cf0a2d33a499cc60b70d63/sulatebadaken.pdf
    • http://kuzfarm.ru/images/file/tenidutima.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/ragatewoxok.pdf
    • http://esoftland.com/userfiles/file/69357685968.pdf
    • http://csc025.com/userfiles/file/20210615215557_08vj4f.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072d68a24014---52382412927.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=extremes+rules+2012
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f99f.bin
c861d6e8ca421536d0254cf8a161036056c4638cc15f458f8593df91532392da
pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 20268 bytes
font_01_sfnt_off00012cf7.bin
aa09a1fc6050392a3fb31529444f4620b355452527817e7171af10b15dfe30c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF7 10272 bytes
font_02_sfnt_off0001444b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1444B 16792 bytes