Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d181fab22ad38d…

MALICIOUS

PDF

84.6 KB Created: 2021-07-13 17:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9de5efc551940b78a2be6d5c45f9cb85 SHA-1: 67e560075e877803ca5e9f518de5c0d8dcddccf9 SHA-256: e9d181fab22ad38d3104f2fd4fb59ddc81cb2cc2dc4880a47a498a6d4ec4a538
126 Risk Score

Malware Insights

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

The PDF document contains a link farm, directing users to multiple URLs hosted on compromised WordPress upload directories. The ClamAV detection and heuristic firings indicate this PDF is designed to lead users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4017

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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082285fd72c3---72599219599.pdf In PDF document text
    • https://srilangkapools.com/contents//files/sufulajasab.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/gosanizug.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c7654bd0---59722640424.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e87cddd23---65384916573.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/19984810140.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f10b393c---sodagovogoj.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609de534f21cf---21576175633.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/mubuvalokabokimuvexid.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3il00vccaspjidjve9u1bebm94/perirolida.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/divexazavekaxekiz.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/uusafea518mh9fn7uverh2sct3/33772211216.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/dawerowawokajopu.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/87951639050.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/bajopol.pdfIn PDF document text
    • https://seerupit.dk/assens/file/nobapevokoruzena.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/jobexumofu.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/disoginisixajoze.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210604_4B437135277E0E33.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a05282986cb---jalawoboliveseratenebez.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43d5df51a---87897446022.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3f3fe1925---gumitafosetebogabumaze.pdfIn PDF document text
    • http://yuha.be/_files/file/88032338752.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a016b07c92e---buremomiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=francis+abernathy+the+goldfinchPDF link annotation
    • 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_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 10984 bytes
SHA-256: 6b313649185cf63946a6d68d42a9fd0f77056641deab4bb715b7b9b809091722
font_01_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 17388 bytes
SHA-256: bca9b62fd605ee470d42e372a9cf2f94694d692d4d572856b5feba6463d4f136
font_02_sfnt_off0001334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1