Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c0fc8f96d641a5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 00:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ad77eee0501d578ce291a801e51b59bf SHA-1: db119c20777c548ce356eb0869278c454d4272e3 SHA-256: 56c0fc8f96d641a5220e3fd7fc63dce600d1305d75bd9cd02726bad42ff75a5b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to redirect users to malicious content. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=spreadsheet+with+data PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/taxike.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210708_220621.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b3a5243c175e4e1bd5294195b543d332/44049509805.pdfIn PDF document text
    • https://kede.org/userfiles/file/89241922495.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ad637ba1a2ed1bb2ae9593dc82c411f5/86562645806.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/21cb4a3228891298ddc09b2b12a66a01/2160196840.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d33f63b22f---61736314883.pdfIn PDF document text
    • https://mytopics.it/uploads/file/zuzesotajaroxak.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/52beb0f7309c3c637fc9855c2b4bb22a/dokotebafojetepowusakaxo.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/92992129377.pdfIn PDF document text
    • https://loctra.net/userfiles/file/sorubowevesuwogufegexajuw.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/42154618153.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/35415639471.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edd183dfd0---4853646887.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/80f917aeec636403aa469e5cb4ad1d77/65730632847.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/luzuxezonowudap.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd1d39879---divofupopagakob.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///54233917130.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/403496010611600931f589.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/wijurerodovuxoge.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/deb7216d7dd6d2cb58042ad4f589518a/ritopinuloloxelunozam.pdfIn PDF document text
    • http://annabarons.lv/files/files/55312978691.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070d12450721---22738942657.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/p9qiu3ob07oqvn5pceijo8cf71/kexumurodeteweradozel.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d375bda45---xesevibelazoxus.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_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 15520 bytes
SHA-256: f1ef93b4b465d970ae6081cba26db2503ad6c0ac1b364dcdce58a05e65357403
font_02_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 10380 bytes
SHA-256: a7d471da30aa10d094d1120421a4f645d2c8bb714fbd3975823bf5d1492fd4af

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