Malicious PDF — malware analysis report

Static analysis result for SHA-256 69805592c3ee8800…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 06:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 266e969f1fa73f7f15c56ba61774f92f SHA-1: c77ee811bee313f0ef4984a101a97989a52ab972 SHA-256: 69805592c3ee88009a708d36e6815632e047033979ba6f1231a3c2ae423c56c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms points towards a malicious redirection scheme.

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://heyumpnd.com/userfiles/file///buvugitedofenino.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4cfd2eb4d56d159d63e1b9bc18e46483/60077224172.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/12626651488.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/kasalawavapinofime.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/jamujujoji.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210729164207.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae66cfa0990---77889217302.pdfIn PDF document text
    • http://xtra360.net/campannas/file/77484148256.pdfIn PDF document text
    • http://www.520amis.com/upload/files/ribifexofe.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/171915264215.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/73258917114.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/wotakadiko.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/242774b2bb8f8aaecd8d002f888fae3b/vavebidokewuvagake.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62279969172.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/gujopigedevosum.pdfIn PDF document text
    • http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/repeku.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/95938536020.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e0f15546fd21ae65250e125a081044d9/5414441772.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/nabelepif.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/95a06f55ab3b27074becd3c099ca63b3/fedabakofebodanopema.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f99ae7c9f55d77f2ebf5098577693b70/14320196952.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1468b038f4---livomototukive.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/38975000991.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/cd1d483abfe4e4e680fc37986544f230/bazetigibemapamoju.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96a304d3b---15291426109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tradi%C3%A7%C3%B5es+navais+pdfPDF 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_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 20500 bytes
SHA-256: 432044a835d3f64d22e00fbc8088fb4ceb2d66cd55a35bb137e021a2e428c130
font_01_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 10676 bytes
SHA-256: 004d5fc7c458f27d48609b0bc57fa27f70cadac1417fdb8cdcf8ec92b77e272e
font_02_sfnt_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1