Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49a8173e4e51f17…

MALICIOUS

PDF

109.2 KB Created: 2021-09-05 16:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59ba11c6728dea2b14534ea182d7a5e8 SHA-1: 1b9ae510154699c3b9cf41bf0224d9dc0e366994 SHA-256: e49a8173e4e51f17667be1da44c12e7fde61a35227605697f3da8836d4c01321
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to direct users to potentially malicious content. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure strongly suggest an intent to exploit users by redirecting them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://mclarenquartz.in/ci/userfiles/files/jewigikazodagotekuziro.pdf In PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/98021714556.pdfIn PDF document text
    • http://mutitar.com/user_img/files/69672664723.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/66644979600.pdfIn PDF document text
    • http://landpas.pl/upload/file/74000446726.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/a58md1s9oi7hlrv096k7es29l4/kefixerogupemukak.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/tifikidadixuzivubomopo.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/kavozetago.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2ee07fce---62903290314.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/veben.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c966ab5ca5---58841198531.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/71461344226.pdfIn PDF document text
    • https://ewt.cz/res/file/nulefusoxa.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a635de01d---83951755907.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/efd62d36cc6ac76a9d11382ca3abae37/vibixumewanamudinoxuk.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85583952251.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/motujuwopozev.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0qrmc9ns4v3bo4t9g16cbhvvp1/gisofiro.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/68722907423.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3d419ed3b9d0cfa573759b3dd2e67ae9/zobogemamaf.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/vewezumekewixupugedetuj.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/vuzowewitapiguzalixowunus.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f7e7514b6138ad5ebff23e7476491d5a/90079494081.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa36476a48---31026877370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pcs+7+manual+pdfPDF 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_off0001469c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469C 10392 bytes
SHA-256: 39eb40e23da0ffc2be4d17193857d707794f738dc4472161c7f090768cbec272
font_01_sfnt_off00015e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E22 18728 bytes
SHA-256: 7d2bd8134052f0e93b261af66c37d9d0bf313c250521dd852178201c84adcbdf
font_02_sfnt_off00018ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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