Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a62d24db24fd05d…

MALICIOUS

PDF

99.1 KB Created: 2021-09-01 04:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2c0a9d7d2b17d67230f1eaf677812f79 SHA-1: e2815c7327e1226a9ae4d53dcd9c4a6ad0b34f7d SHA-256: 5a62d24db24fd05dfbf9828c710556ce47985155b1f0f84e2593a962b8e530ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, suggests the document functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=good+tagline+for+business PDF link annotation
    • https://sfeerweter.nl/userfiles/files/logififeposinakan.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/97776296209.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210626_82E4A78FB8D8A71D.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/58649597979.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112c0258adea---gepexigowuxal.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/p1b9b4tq8l40odcmcpmuij3viq/xiligogakonexepawanix.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/xutomagu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1b131e799---19206272474.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607faed65bb0c---pitekisoxevotoneluzofufim.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/tirix.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/veviluwo.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/redujexunijesoj.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4894fc432e---zejigejijolug.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/74426673152.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/92190947904.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/mapamituwi.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/mevozorulilizejeborotape.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e9e5a6781---69989498061.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/jabufafakogigerigaxobab.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/4c46dfvi8rnpng7eibjn5adf24/81221291565.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/zuxodikezokogisilebuz.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b28bd068512---rexafemetot.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/0gqqakqea2cfo98nie14l5p9eb/13378835289.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/12949159704.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/rmlthtg8sbpq7n4n1jjcd2uvto/59146091014.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_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 10808 bytes
SHA-256: 6efffa3e5b1347c733405e9e12a451af6c10dec603e2ecbb11b7d4946cb890cc
font_01_sfnt_off0001346a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346A 18864 bytes
SHA-256: 742d3c8c00cc8e3317bd22779ac608acddac8d860cf3d100cdb556274205e3aa
font_02_sfnt_off00016543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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