Malicious PDF — malware analysis report

Static analysis result for SHA-256 691ad56043b8f87d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 07:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 79c0345e5ad479b47c2fe4bcf1052028 SHA-1: 393addf79437925bd2589faf4a9357aae1e5b751 SHA-256: 691ad56043b8f87dfd1c630f0be54e7a2e90d0286d48158bb1880ac04e054b11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=studio+one+3+manual+espa%C3%B1ol+pdf PDF link annotation
    • http://ecompletecontact.com/ckfinder/userfiles/files/27254539764.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/43838029411.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qegesap11hgt9g13crtvau9n24/42870931994.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072003183742.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/98171528927.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/45619140757.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/beujlgkhsmo30ramn5ujdckcfn/direxugiv.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/12675684138.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/favodipolubezelirisobu.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/69592932453.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/virig.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/49224249281.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/19603822049.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/rotik.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zutoregi.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210714_3947589ED2A72D5F.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c6b195bbb---xufozi.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/tukobotelebetepapo.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/bikebenu.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/wazugot.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/kadago.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c834ea679b---44974130255.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/tepobegerizexuvedaso.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/risifulivokufiwudari.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_off0000c52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 11112 bytes
SHA-256: 84500b27cf27ae26c1b8be3896b8d527773f2c3e4ebf54b6eddee7fb4920da4c
font_02_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 21900 bytes
SHA-256: 5afea4ca4e5b4f84975a1b634b2cedc3eeebb3a04ec67469ecf34e44f245fd21

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