Malicious PDF — malware analysis report

Static analysis result for SHA-256 0617787146435942…

MALICIOUS

PDF

91.4 KB Created: 2021-07-28 00:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9b8105568ad98970aef2d4ae717750f6 SHA-1: 0897028b320e3093572b990e813b681846844ac8 SHA-256: 06177871464359423ea20dd17a953f90a237a98d0148d49f3effd0435840e6cc
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or redirection scheme aimed at users searching for specific content, likely to exploit them further.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bygreenpure.com/userfiles/file/ladisepugijoberewe.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f220b7200---fibomivumekakogodiropodeb.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/44847241118.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/kinipunorugovulanujepisog.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f25e93e0481---vifemupexurogezof.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160731d00b6ff6---puwurezebabovuxagugamomis.pdfIn PDF document text
    • http://nenorm.com/files/files/17218097130.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-6/20210706171220992396.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf3b370c6---sofiwekunuxizenover.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091838d54087---bomuzamobawekuzajozosefi.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fb6a0b5e0---7975746221.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/podil.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913cffabb72---20568226295.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/fenizerotib.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608101296cbd1---derusovanifude.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/fb934466687c5ba74435e2ae83d7ac8b/lusitusanubexexow.pdfIn PDF document text
    • https://marosme.ro/hirek/file/74144450251.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/20918981401.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/mivufusitos.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/89740a793489031f5b8d752d230b1f71/49858405949.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3iaui4jum9ft81pr3p6bd9r76i/18555451275.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b3310f094e1b74c0092211eadf302f05/83019250898.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/10191045816.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaff86fe22---75029357054.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d89c7b08---wepidolarozipafizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+tank+build+neverwinter+mod+18PDF 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_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 11204 bytes
SHA-256: d19c3440f64f55cd14e2914baf16f767001613f054d38772f1df9c6ea4eac3de
font_01_sfnt_off00011ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC1 17352 bytes
SHA-256: b14fc6ec01c1272ec15e797423a755c1d3eedc8090c9e3a37e64dc83e72a5e1c
font_02_sfnt_off000147da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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