Malicious PDF — malware analysis report

Static analysis result for SHA-256 2453326bebfc744b…

MALICIOUS

PDF

81.4 KB Created: 2021-08-15 14:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e9867b78be41fbeafc600ceae7c74df SHA-1: 29e2cf9f5d15ba6f590fce94920fbed3e503f85f SHA-256: 2453326bebfc744b97a120e50e21095469ca5fd6f8c40552b7edb39a19bf5ee3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress installations and disposable hosting, likely intended to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1fb06bf84aafdc93bdc769cf7dfac110/bokorizo.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/kcafofhs0mtb3e54cpfegujrrf/lelivarutute.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b518a86494b---liseg.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df6003304e---fewimive.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/96781539741.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/tevozufodawasufofopoz.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/tft2450mqothdmdplrq54sn8p2/fubijegipidozugevep.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///mujuxekos.pdfIn PDF document text
    • http://erex.hu/upload/file/sibuzuduxexinudakixoz.pdfIn PDF document text
    • http://gabortech.comadmin/file/fuxuwapukefuwemuli.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/96785570347.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/69118408640.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7da90f246---36187892662.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ivodevs9mr7s07pbcu4glft5s7/pivepotojexoj.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/96970993831.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/waziguxovilu.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/zizivejofekoxugadivus.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9765765d---piwugu.pdfIn PDF document text
    • http://freeski.hu/freeski/file/tipitozusoxetuwavelarurub.pdfIn PDF document text
    • https://kede.org/userfiles/file/32067535982.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/81217962986.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/87936547933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=saroja+cut+songs+free+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_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 10952 bytes
SHA-256: 0deb5ad2422efb7d2619214580b06fe638e51d4dd62cc0c5f0fa9d8cf786bfb9
font_02_sfnt_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 16636 bytes
SHA-256: 77f5e99faeb671e63f7289100e1ddf46e73a474b2a658440a240d3206d38fa17

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