Malicious PDF — malware analysis report

Static analysis result for SHA-256 05146b90a4aea906…

MALICIOUS

PDF

109.7 KB Created: 2021-09-03 02:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3321345466a4455fba64cf1afd81317 SHA-1: fe0c2475c991206c111a3419f37de64379210e77 SHA-256: 05146b90a4aea9065cfd082cdb8bf66d28d44b0e9b636c6737cde7c9ddbe5253
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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=rinnai+energysaver+308ftr+heater+manual PDF link annotation
    • http://gillsandgeckos.com/userfiles/file/10464709312.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/rowejigawabu.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/ligamuxutaxinute.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/tetazirusotuzi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a20c83d6463---fiwelovopuzitasez.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/23422828949.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160860907189a8---zamuwi.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/25901461060.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210714050353.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/30147885070.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed43055c3---80904834664.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/denigiwipugajobos.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/gobawatudexopajud.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126186156e53---gowetaxadejivisori.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/58307719217.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/futisar.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/jawoxemipogidavogumedor.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/wukodezazirezuziwam.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091155c704b3---kawazuwapajizufixuzukik.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/dbct50joav9p5j0iuevb7raro0/jopijiretiku.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d274ee3020---77517523772.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f308042ad---49721056409.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_off000142f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B03 19580 bytes
SHA-256: abef6d347de407d97d516e77517d185d722d1034407f9dd951d91eb82e2dc98c
font_02_sfnt_off00018dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DCD 11368 bytes
SHA-256: 68d993ccd39dd313be290a911b08ff930dfed2a13d8fe57f7350a0fab964d41b

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