Malicious PDF — malware analysis report

Static analysis result for SHA-256 a638bda6808b77ac…

MALICIOUS

PDF

83.0 KB Created: 2021-08-01 18:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a45f7c915ef4ca0a8f9160b3b6096d8 SHA-1: d9cbf18b2be4559070f36d4d02da250eb867d28e SHA-256: a638bda6808b77ac640930d89e9167ffaf67aa9322857a0c2ac00c4aa24f54db
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass security filters. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=descargar+dragon+ball+z+budokai+tenkaichi+2+en+espa%C3%B1ol+para+pc PDF link annotation
    • http://adabaskimerkezi.com/upload/file/8256827057.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/c7cae40bc52ddea3135faa56da55109e/fajikifo.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/jotikiferutile.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/llqqf47vriqm6fmr0ngqnm0sg1/kuwujetigufafek.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/sidek.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/fipera.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/fe370f1f8440fb8f40c696f58c07aab4/57166690527.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/4790152225.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/27849184175.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a197a0b44a---goveminixawusex.pdfIn PDF document text
    • https://jagominum.com/contents//files/soludawuladizan.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab9809d6f---99481442176.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b057e3b2e---19507562260.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/79960502962.pdfIn PDF document text
    • https://anup.bo/images/files/pizixomanafowemivojidu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160817e8d45c9a---57094022860.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8cf6bf39---88882533282.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0fa5360782d6804e8c188a7e7c0de45f/24858379548.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6d943ebea564f8f2f69584d03974eea8/wazukevivejireneg.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/97940503876.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/95363202338.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/pagofetajotopasanixu.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/d3qaq1p76t5oiml08k96at94bc/motesowelitupesomagum.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5gmp04u8d1jfqtlrdpdsplrgvb/sokulakovuxaraf.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edcd49b754c---30921299940.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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 19856 bytes
SHA-256: a4b0ff7bffbc723786ee0aa28b26d2d8f42c8a04406fc1f557947841cf9de175
font_01_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 11512 bytes
SHA-256: b5082b0f5ccfa5d07f677ad322cc22dffcf2fa0ad70b312d9039ac363675338f

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