Malicious PDF — malware analysis report

Static analysis result for SHA-256 45eefd9734bd3b62…

MALICIOUS

PDF

74.8 KB Created: 2021-09-28 18:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6885e5619164229a7b75c906e2178b7b SHA-1: ccf68b39046bc35683b41c3d772c1ad150edd824 SHA-256: 45eefd9734bd3b62e03e0e534347a88b1077878ab5a8b14710e565ebf21e2487
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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://ksdc.in/userfiles/file/fowizuwoxex.pdf In PDF document text
    • https://amigo-shop.105h.net/upload/files/nukeperexarota.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/2306319963.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161443f98f0c6f---sesarebo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426c7a4bd6b---molorunixuwonitututudozis.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/damuxutej.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/vemojudativorujotalu.pdfIn PDF document text
    • http://bibikid.ru/upload/fubiw.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109020522051181.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/rosawarivutosa.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/gaxelopefuteg.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/nerevirapematixikepev.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/60a6b73b3e5e99bf20e736901ccb4c23/4432509809.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/45029961938.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/wagejogu.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/20997728548.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/gexutuvenavu.pdfIn PDF document text
    • http://lifecareproduct.in/ckfinder/userfiles/files/fegunenibomor.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210925125451.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/mulofive.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/39141411750.pdfIn PDF document text
    • http://master-br.ru/img/file/kitosepizala.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/45725765635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=temas+para+celular+huawei+gratisPDF 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_off0000bba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA4 10744 bytes
SHA-256: ce244c18bb4b894c5fe17011328d9511ccb4e49d804a856375821ba118b5251f
font_01_sfnt_off0000d46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 18656 bytes
SHA-256: 6fef341a9c6fe6f002510ae22df4e23c539655ad9f043b1e5abd964b8cb04ce5

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