Malicious PDF — malware analysis report

Static analysis result for SHA-256 7103db8aded2ffc8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 21:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e62c53d6b7f461d1eed76227a32cc82 SHA-1: 91dd473fdda0874c475441606fcac161440f4f11 SHA-256: 7103db8aded2ffc84d02ca62f7e3d5f4322ee94333847accae6805f24c7aa5f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. While no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings indicate a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822b19bfb41---88758436243.pdf In PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/goputo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f0e659d63---ragawuparagenom.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210606_2A51CEC9467F12E1.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/segatozesolas.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/12166318797.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3cbf65cf4d---wozuxofi.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/ratozeximurovituzi.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/49326838117.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/nutuwedanopurazid.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bba791af9b2---84440795030.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/nizevituzebodovizanovi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607929a4c4892---34909607017.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/83303223420.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22560952d6---14361818717.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/xagarofiboxuwufesuwal.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/reziratete.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/578800a5f7fc9a8533ba3d8dc6ee7638/xevefunagafoxifofuj.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afbeeccdea2---50865975237.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/mipexuvi.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/80579905045.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/34301788854.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/gurulajili.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748884dd367---38593490626.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c15216d23ef---54596646834.pdfIn PDF document text
    • http://ezibra.pl/upload//file/bumuxumajasomurovorutaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=inca+cancer+de+mama+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_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 10208 bytes
SHA-256: 4da9701b78ffa12a73c11f58e8966a28da8ba62dedfed46e56dbb2ad1e683c73
font_01_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 18888 bytes
SHA-256: b025cf10145020e2520e1ce81c60e1b7d4e877ef1468c3222a8630c953570212

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