Malicious PDF — malware analysis report

Static analysis result for SHA-256 838787c7e199f613…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 04:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80b2052deaba843f0688cf08640b608a SHA-1: 9e5ce3028dc09eaf1ee4c092a77407cc9aff9b98 SHA-256: 838787c7e199f6136fb64123e24277740c7ea7ef4fd92b8cfd720a70cce78fc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://seeandhearbetter.ie/img/shop/contents/zijifefaxoxofebofeketezo.pdf In PDF document text
    • https://lienlacanien.com/img_pages/file/dibopewovafu.pdfIn PDF document text
    • https://viceda.com/userfiles/file/rupaxogawefepojimiropozi.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/paxefoxagavatevoline.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/41570706250.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a727bbee77---bazazevobesimudoliw.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/kototisewelubinuwuni.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613598b939f12---lodoxotafi.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109200351492535.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/nezapatevakugugebor.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/podupomebibenufedegidexu.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/95730674873.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/fusizore.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/75840946911.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/julelinoseketajak.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/rotolonanozibujumik.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/59005259381.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/ronobefikowulef.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/mevagake.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/kejesagozujaw.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/jopumewabijiz.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/tadozobav.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142d795dafae---ravorifotufibizukilax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tamilplay+2021+movie+downloadPDF 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_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 17924 bytes
SHA-256: 76190b736c0a1c47f70067347eab0adffdee24d2ce3663361b99a4ea70b11adc
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 10712 bytes
SHA-256: 55744ce979d4196bf02380701d62bdb1038c74510b3b8f0b663be8e198b367f5
font_02_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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