Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e93f084952264c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 21:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb3438ee7fc4dae54b76447f6bb45d78 SHA-1: 1aa011f6b09a6183f678b9dbc4bb70d66109c739 SHA-256: e5e93f084952264c575a8ed0159a63934e54e11bf3a9c9fe42c8f5cc98a638fb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm characteristics strongly indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=cautivado+por+la+alegria+pdf PDF link annotation
    • http://nhagiatxanh.com/public/default/ckeditor/files/pomajodebixosazi.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/xoveru.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/9351787525.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/58012564030.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/tonogadorenixejijimuxad.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a30d99d1af---85840477120.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8dab708953c9193983709ea392b83e7e/sibawesarasugur.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5glhssjb7r10mqdadq9ut58fd1/lofamaviriramoledomopo.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gqc0t9r38qqj6o8jadv8p723fj/5349570855.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/59018598717.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/17c6ed96aa1afc17eb9973e330166645/932003894.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/62375349006.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/sonemibukex.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071661c2b3a5---60553470097.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160885ec127ee9---luvujekibobinus.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/wasozut.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/15639887325.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/lelimapo.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/79575077359.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/nuwomop.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/20230492441.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082980f1ad4c---pajakelovulexakozafasoxa.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a42025e4f93---66794874765.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/80878945965.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b317ec596ec---79448165502.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_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 19584 bytes
SHA-256: 3d1453506dd7ce21e1bb1e0ed9ba444f6f88aab9bb8becdd3f2c8345853c9e34
font_01_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 10600 bytes
SHA-256: fb0aab5cb2cc66a0e9cded408dd59541e3a1e4bdd3a6976add9494dd0d5db50e

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