Malicious PDF — malware analysis report

Static analysis result for SHA-256 125d0a46203ece01…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 09:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc13a14a75fff94e61c9ddf6c041b5b8 SHA-1: b763fec119ef2b71003cb9a454550b55a04df095 SHA-256: 125d0a46203ece0150baa0393f6381d4865dfddec888c92b51056f4349e96fde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for malicious PDFs. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://e-midas.ro/files/file/dewejubojedurufajafegoj.pdf In PDF document text
    • http://artgrafika.cz/userfiles/file/75307786468.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/daluxaweraxaxaj.pdfIn PDF document text
    • https://led7.ru/file/wukulurijifekuxabed.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/sivogoleritizevinawu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff05e87e66---47036155332.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/94766473567.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/66295811202.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/67199697493.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6bda072a607496b3174664d2abbb7531/6344692017.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/ropuxifexurunogal.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/novufifunagetivo.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/livapinobona.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/kizuzak.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/58251882828.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/jetejerogivavanaweraf.pdfIn PDF document text
    • https://andrejc.si/files/file/xafukelorid.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/fizakurosirogilegaje.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1a501c3eaed8cf4b4bf14451684fddbb/wogoga.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/vasekoridof.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/lonug.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/85690990551.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/52780867075.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/diwow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=would+rather+had+better+it%27s+time+exercises+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_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 17264 bytes
SHA-256: 4019580753edd9c71dc0f9a50a405998d4f0b7489e4d37576ace3cdf7a6325ac
font_01_sfnt_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 11148 bytes
SHA-256: ac5bde6392c87f368ee20afdfa379de53471f82a821c07a9eef943e89fecf6e5
font_02_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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