Malicious PDF — malware analysis report

Static analysis result for SHA-256 d778f7a1e8a2df2f…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 06:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d9cd862405f95d7b9a63468081a01e5 SHA-1: 2805e5214d422a543707be820225a879187d427f SHA-256: d778f7a1e8a2df2f8233a9a827592bc3eab8a54446498c3fe3a7ed642cdbada6
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests the document's primary purpose is to facilitate traffic to these sites, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is weaponized to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=smart+bracelet+user+manual+gopro PDF link annotation
    • http://innovad-ltd.com/userfiles/file/71981427867.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/buxapavuwafofi.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/92plg4718d44efddt51rl5nps3/23109318771.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607391be37757---lepipixox.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/3734621345.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/zaxisezuxanu.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/lupeze.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog//file/wanoramukoporerifiwiwesu.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/gujonesoxugirivanuwos.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/40167700177.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e45261801---93765014367.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d86666c8c---21850980268.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/jusofuxelilufeban.pdfIn PDF document text
    • http://clarasonic.com/upload/file/binupikumoneseb.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090927540a8c---sejafonefudidofanonudoz.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-13/20210813083652695053.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aca0a8dd6---gokasoborov.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/geborewifonu.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/rewiwajewori.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/53392044476.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/35489237391.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/lasodukixa.pdfIn PDF document text
    • http://gardatrans.com/content/Files/94761672737.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/68187852529.pdfIn PDF document text
    • 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_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 10940 bytes
SHA-256: 5e27c3a0191f4f4c2c411cc5e2ed59d2c9d4043e68d48970f21efdefa1a40e12
font_02_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 18436 bytes
SHA-256: 4196a660dce10c46845c39c80cc9592b1292d69c09817a84cb14cff041d72c96

Open this report in the interactive analyzer, or submit your own file for analysis.