Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba337ab75b08519…

MALICIOUS

PDF

87.1 KB Created: 2021-09-03 04:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55bf53172a69d49c9c571b01a6aeaacc SHA-1: aa1ea22790275f083aa2ec872ce77769e904650f SHA-256: fba337ab75b08519bd1e424c2b0d8b16b47b850dfae95ed93fe2f862cd3be1af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of a UTM term in one of the URLs further supports the idea of SEO poisoning or a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=ielts+writing+task+2+topics+academic+with+answers+pdf+2019 PDF link annotation
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf08c58c0c---morasidowezipokatorurap.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/9982b26dfdc136c1cdbbc7e17c2e9a45/vikare.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/99781594785.pdfIn PDF document text
    • https://emmaushuis.org/pages/47534627573.pdfIn PDF document text
    • http://suara.ru/img/file/legerewurimatuzomabulob.pdfIn PDF document text
    • https://33mobility.net/uploads/files/senopanog.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/delizujixupete.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a7a1e24b4---bodaz.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b643ac96---72286563164.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/gonepuxejixela.pdfIn PDF document text
    • http://kasargod.net/uploads/file/79264150061.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/vajunobigodigutogavul.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/98343088312.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c4f236356fa9b3f1c52a7fdbd19f8181/90550783307.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/64273953450.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f266713a091---67920360701.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4c65494a36725c16b3fe6456050d31be/mupupatosi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/fd3535af3d75cebe1906f16e2ef4c585/toremov.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b7fb15a6d---linikona.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wudiputa.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77746892521.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/81964364597.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a11f1efc4---65391580370.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c6d21c18366777abbf93985e4a6af61c/17155654437.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_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 19508 bytes
SHA-256: 70a337098bd5cd0c570f8a3639532006c8dc40150d4dceef5084f732eaf7b00c
font_01_sfnt_off00011af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 11656 bytes
SHA-256: bea700b288e45801211bdb75d2f12910b7346c581567c7b1764989df5e588d71
font_02_sfnt_off00013673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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