Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd950111ca8fec7d…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 05:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0915ca5d1e88b5513463f79ebda1412 SHA-1: 2247fdd2a253df2441e18730a4020011e2571298 SHA-256: cd950111ca8fec7d9d21c3c2fbfb5c49dad54ea6bceb8b38edf51027dd44d252
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=biology+line+graph+examples PDF link annotation
    • https://sunarchegypt.com/userfiles/file/27625434707.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/49066249779.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/87131402022.pdfIn PDF document text
    • https://businesslife.com/content/file/42855985506.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/satevobakotix.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2630a1451---63410729846.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613eddbbd52e3---29674115310.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/79192194648.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090109594335.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/40829159837.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/36983333078.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/sodisoxa.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pkv176ptkin95aodj73e9o0qo9/betogejajaga.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/gusovofegukuzavetenoxali.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/64604110041.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/45661835841.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/63154635087.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/88250088721.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/kosimimem.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/76843464388.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/18492100837.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210917190354.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/dutimaguf.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1cc62583a6beaede5b125cb3a35b1369/55471259157.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6f7960751ae36c1b39db035580f4a1e3/81502975473.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_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 10868 bytes
SHA-256: 94a702fe8df2a0e074508395d27428553f65a25d117205eb450746f7e1e21558
font_02_sfnt_off0000faa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 16884 bytes
SHA-256: 39150926762bcc13e0c4f095a84f766d1f5279275c6ddbb162cb5a40dcb085f7

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