Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8268e606574c3b…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 22:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87802d7cbf73c5cefe58dd395b3e66ba SHA-1: 56b1a70bc3b2b97e896a87d26223b6f600067d29 SHA-256: 6b8268e606574c3b03b73ebca62f7937a1766d561e7295b859659802ad8cac32
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms or potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fptica.ru/images/file/weseg.pdf In PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/witigemenurokoluw.pdfIn PDF document text
    • http://myslizdrave.com/soubory/wuvazoketanuxupoxasakew.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210906211844.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/18966964009.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/reboxenexujoteri.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109090837385575.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/19559987890.pdfIn PDF document text
    • https://forumsevens.com/images/file/bozuxikodomizegitarowofej.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/33215564919.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/17561862317.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/nepusizomamanekibowem.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecef6681ea---goxiwirus.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/80124269912.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161328c47104fd---sofivasapizizusakijipun.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6144D8ABD1E80.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/detawuzojus.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/95631433875.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/damejawewejaduxabikatite.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec67b37479---63765883367.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/maniw.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/25294060590.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/79561833461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+upgrade+ram+on+androidPDF 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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 17912 bytes
SHA-256: b5b6d26c154a782c0e3f2c1ba5c955ee287f6e41a306c5465d622cdd8224bfff
font_01_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 10700 bytes
SHA-256: 8c480a0077edbd68b2710deb2755156f3fbfbea66728121aa8440d281a2402a4