Malicious PDF — malware analysis report

Static analysis result for SHA-256 127e959151de60ad…

MALICIOUS

PDF

102.2 KB Created: 2021-06-29 00:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cbcdce5776c4cb3c1df3f797742a0d0f SHA-1: 6299a297786144b49393195aa3deb3fe852f7818 SHA-256: 127e959151de60ad902a37e64b40e10468048235d6e6c79200b78f60aedb86b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://familienbilstrup.dk/userfiles/file/tiwikejum.pdf In PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/a858t3gs51npnpqrle9a1aljm5/62678422710.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/ragipokisugutumavuzo.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210615203203584.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/rigazewugakezon.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/zewadojawodapu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086339bc2173---xuwuwis.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160883c6ade454---1313049513.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ek6lkm9emu9467kv7e1bdqh03s/76664568859.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/22322579405.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d2c39373---tejusukuziluvomezo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53e8e6d54---77691417030.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/882328ccf542cc89ef652b44f21e61e9/22409243306.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d269677b---tujamudevibazunupob.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bjj4h3g60jj963bh9gbp1uo2hd/nukufapesipekerisiw.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d09307a5---45596596852.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072f2685db81---85515590332.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a6f0203ca---64481051034.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/b4vv7omvbnbte7vupleu6s17d7/73847416173.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/kodolamoroxamaroluvus.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/5575826021.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca10a1da58---27480078949.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e057f287991f5bf7a8f865090c422d99/fexofuresimek.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ea93c2aec---bivekokavokuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=365+dua+with+stories+pdf+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_off00012c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C34 17188 bytes
SHA-256: 562787c73432f63561feb070ed728a0735a398f28f996d752eca74574c1ae80e
font_01_sfnt_off00015913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001712a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1712A 11160 bytes
SHA-256: b5cc9c052df0f2997ba5c68390798a47a0c3a2ac4fcb660edd7481c1856fc9b1