Malicious PDF — malware analysis report

Static analysis result for SHA-256 1583dc5a9d4cb5d4…

MALICIOUS

PDF

93.7 KB Created: 2021-08-09 18:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a21defaed46fa9f337372f6a92d4ee79 SHA-1: 056868f254f841d4f3d3ce248580f717b222f519 SHA-256: 1583dc5a9d4cb5d49b854928c7a5c255c1e249bcc8a4ea2a0ba1f19a2da9c0ec
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://soudurelauziere.com/upload/editor/file/fuxokoladomilataw.pdf In PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/76023893593.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/ruwusofoligozaziv.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072f89bf1419---poginutupemesit.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/58paqa9ff4643iefahg4svnn50/41289160409.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83138b0aef---78323996054.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b85ec0959---jikol.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8c7a0bfc8f0ad5e836e1f79c1b476785/bozovozejalamasadumitoti.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/31024564859.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7d155935f---zofubojavo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6eb6d327a---27529555505.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/roromadudisafaliletapukuf.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jokbddcgis2ahdmg4a6cg3hg73/dakujuf.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5482ff5b0ef88f4a2b5832208aede064/91874666071.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/33355884542.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16071d9d9b76e4---xugekavulukewod.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/sizanezemipexugut.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bceb0f957e9---30196165888.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/kibalojebose.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/kugizofaguti.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/vtva9bdlpg43vp37s6jvrrqi43/32599741264.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/55735574339.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ee6cd0b3---56025772183.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/45597180045.pdfIn PDF document text
    • http://markone-tools.com/upload/files/jekaparasuzusuragelagola.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/84618463234.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/q54ukjleum8ij5qume6d1gl490/77677431250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=why+isn%27t+my+mic+working+on+discord+mobilePDF 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_off000108f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 11112 bytes
SHA-256: e5e8c01601784dc0f0922aadb9e3c019d4ae429b54d9f7a54d38c0de6fee032c
font_02_sfnt_off00013aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA8 17124 bytes
SHA-256: ad82546974b87dbadc4610b5835c0e5af805c3320467e14e6a6cb6aca5202d40

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