Malicious PDF — malware analysis report

Static analysis result for SHA-256 47340b66ccb2008a…

MALICIOUS

PDF

106.5 KB Created: 2021-07-01 14:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e8e1eef13ba84a327d83ccf57d3c8683 SHA-1: 27149fab31efb6367a759e07e5ebc98406ed3b42 SHA-256: 47340b66ccb2008aa8312cb1839f1c43407cb2c2a7193bab60d2b841e0ca7f6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure point towards an attempt to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/o1aceplr3kqoa9ns0a1afk878l/47728889900.pdf In PDF document text
    • http://sys-svinding.dk/userfiles/file/movizorogot.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/motedofixinojoposejinabet.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/11755860978.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c335358f5eb---bodixawe.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/49352158081.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u0bl91p4gmt2u5en6cbk2h5md1/felinuvemo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc8a38844---kamimenumanukide.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/runokolafobemogedudabi.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/102093866760a7c786a2f03.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00ae2da17---50585607305.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086c736b114d---24102134164.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vcsgadej5tgu83ci21ah5amnin/gosukuzupupe.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/datapi.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/bamivofadakonezoxo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c22dade0dfb---luditupimil.pdfIn PDF document text
    • https://kopari.hu/files/file/52024759466.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9865cd812---xatuzutafulusofere.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a6a67c93d---2967561079.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee10c1110---48380247090.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/45503c99af5b3c58dc733944f27c8251/zofovuborofegapugafowuj.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073848466c03---6117733727.pdfIn PDF document text
    • http://vhktn.at/images/content/files/90123499429.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/54038c8ed9d04925f7db7ff1d83a237f/54294171015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=home+science+textiles+and+clothing+pdfPDF 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_off00013a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001527c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527C 11060 bytes
SHA-256: 44f67e265a8f271164f76e092481d5aad21d66fad0426e02212731fdb4055ca1
font_02_sfnt_off00016bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD2 18924 bytes
SHA-256: cbfcc981defd7082f23e7caf0ae22f8213a8ae4a1b040e134041c0517bea8957

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