Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86d593d63b188e6…

MALICIOUS

PDF

92.1 KB Created: 2021-08-25 01:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6ca63e73ed40a60bc6fbf1872499a6e SHA-1: 5149112f8907ba024b7a78cdbf8e67408530d9b8 SHA-256: d86d593d63b188e664245e8018edb491a594f9d412c6fd9ddaf04201711f94e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites, potentially for phishing or malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8u88km8km6ktm57vt3qood0n7k/59977233252.pdf In PDF document text
    • https://jahanchart.ir/data/files/file/63112986332.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/wolebeketukobawerusafej.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/59555803795.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5a06ac862---50777471710.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d5d857b2---gogugonafinixezaxofixav.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b015f00469a---74216520645.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/25479182141.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/pekf0mu418oh2q81lq2hmt2876/10236260665.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/gibabagovorewaka.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/cf912bc8744009f66e16793bd3b18a00/88682770357.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/97660752413.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/kadovovol.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b59c8bace---fatadupabufakivuvigewes.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161027d760458b---gabarorogoxof.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/qmceuliljpg4mcelooq60pa4l0/nagumefejep.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/nadowevawipifuxolotol.pdfIn PDF document text
    • http://feast.to/upd_file/75825286399.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e34a18bd224fb3ed184c9fc4bc2bed27/46296896572.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/69787264658.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/pidaresikivolazadoguva.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/tizumemil.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/4863359589.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/34479453360b882cb3a99d.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/d95alkpp7o91kdaih1nakdv89e/lazatalos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=where+are+the+tropics+of+cancer+and+capricornPDF 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_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 10664 bytes
SHA-256: a70aba4e79405cc9d51a9e50eb482a00771b10fe65f97d6a345cfed62033c5ca
font_01_sfnt_off00011706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11706 19160 bytes
SHA-256: 4ddf1566c8c49ac33d78c3e417b0c03d3f2474f3d2049fbb4e92cd104ef1943d
font_02_sfnt_off0001488b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1