Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a756bb70ab00f90…

MALICIOUS

PDF

67.7 KB Created: 2021-09-19 04:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7bb485d46e041d7130b7c46795d2c129 SHA-1: 2ae039a99f9903e660429442265574ab44ade8ce SHA-256: 9a756bb70ab00f90058e9d1b35443d44c91d6b7cfcaf34b359c3f671586935b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points towards an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://laborke.ru/uplcv?utm_term=multiecuscan+android+download PDF link annotation
    • http://jlssj.com/qianzi/upfile/case_editor/file/rizaduriguxapoxopotox.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/29016164560.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/judujefemidezelaxevowil.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/66545926359.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/mebesawama.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6c6f5f758---rowozejarojojovugok.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/raxar.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/bojexibidurojirexasujat.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/94631505159.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/kikilagobanonomorejamojag.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccec8f23aa---zigulutezasalibuluzox.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0e354237---99740872667.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/fibijilona.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/daxubumukagura.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/57258091236.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/wodopat.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/79383589496.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/47709455999.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/reruwobekuwuniw.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/disovu.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/93053873547.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140794d79289---46063179421.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/73486083973.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_off0000ae01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC618 10544 bytes
SHA-256: 479062839ae1a0828f440034a53dfe995d8b6e0fb9ab803647f020dfd24a6b55
font_02_sfnt_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 14336 bytes
SHA-256: 0f230a63c0b1c7df471671b4039fee7605cb72b3cfe136d7c73147f0b20890dc

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