Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c98c9fb0d8eda43…

MALICIOUS

PDF

74.0 KB Created: 2021-07-04 18:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ce9c8f90ba6dc30aaa387190a2b1cab SHA-1: 4ded346fee43a9256faa507049608b25882ce8b7 SHA-256: 9c98c9fb0d8eda436cdca61c2b1de200b2ee9f10acfd5c9d10abc6c75e347feb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external websites, many of which appear to be hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The primary purpose seems to be directing users to potentially malicious content hosted on these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=english+ferry+class+6+pdf+download
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8928b5ff0---rovudanurukus.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fc0f631cbfc9a87d552c4bc5b850946c/58457908968.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c1e62b4b323729fa42c3e6b88249da5a/pupoxujexofevepedofesoz.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e192761075---40788395843.pdf
    • http://minutemen-jrotc.com/clients/84940/File/45596509732.pdf
    • http://baigeleather.com/userfiles/file/sekijojowarovuwonige.pdf
    • https://turkihale.com/userfiles/file/55461969507.pdf
    • http://kadh.kr/bobod/upload/file/32573544559.pdf
    • http://hopkinshigh1988.com/clients/75739/File/sekawubutabetipugosarim.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4359cbc04---powotavuxutesivoxupixab.pdf
    • https://mfdesign.hu/files/file/gulukiw.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca07386116---wexogusini.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/h9fbkoql892isjkkes9shb61bv/tudazekesur.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebbfdc1599---9681391360.pdf
    • http://bettynblue.com/upload/fck_img/20210514/file/fefejasimamaxul.pdf
    • https://jamisonfurnace.ca/userfiles/files/63088458429.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed8cf2f72---65446776608.pdf
    • http://ck-tct.ru/userfiles/file/wokikuzusaxedamimowi.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762791905e6---vomevevadonasepeb.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3efdabee3---48224190894.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3d8cdf475---wozusulumijiwukaxitosa.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/d91b333f0045501792cbf263d457800f/fuzufutabotusofetuk.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/d2fg5ki3q264ddj677rnog9a6g/66790917193.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/q6q9m9j73948sim5ajue8guiss/judazojegiruzasaxim.pdf
    • 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_off0000c01e.bin
7ced3aa27fc9b7c4a50d69d06509e57f993517acf26abedcb05321a85fa0d57a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC01E 15716 bytes
font_01_sfnt_off0000e8a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 16792 bytes
font_02_sfnt_off000100ba.bin
68d1345962ab6f875b0592c9a6a7a3d9311fbc39708071538bc124f6b14a573e
pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 11152 bytes