Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8fd3fd3566cb83…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 23:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ec5f812942fc31c8f4ede857501fb75 SHA-1: 1e9667ddbf092eedcd4ce35203dc6cfb4c9b4a49 SHA-256: ca8fd3fd3566cb8330152b161ee4a20683c63d0493de8e494dcba0aca14b3aae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript (T1059.007) indicates potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=universal+vpn+handler+apk+download PDF link annotation
    • http://bjerkelunden.org/content/files/userfiles/file///jikiwisedikozamuxojawegez.pdfIn PDF document text
    • https://bdata.vn/upload/files/jusuxisi.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/20314800032.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/nodijiwi.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/didalopezotevu.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/83705373320.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8d020a90---87956439278.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/vozufobabegivefavujas.pdfIn PDF document text
    • https://matrixx.lu/images/jawajorowufegekebemanon.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145c9e215166---gipejazininazebuloven.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/powogeturut.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109060352406455.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/35645597259.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161407f69353d8---11696887702.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428a134a33d---62832544409.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/zadus.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/21718079292.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/futibis.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/52348250443.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/3996331166.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/80abcca5888de8537da9712ced31cf2f/52348126176.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/k85k2shpu9h9evt76ehflud9h3/28817960869.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/peben.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3b1585cb67ead2fa45c30ecf72724dec/91762866892.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fb2635de2---34523023866.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_off0000cd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD14 10640 bytes
SHA-256: 9d6c6a03e490fa1d8e25f47efa59b00845b61e3b829e156922c0b6bf050c45bb
font_01_sfnt_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 18740 bytes
SHA-256: bfa507b44eac6d9baf687998c270f8a158777d43db505483c255abf233144ad8

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