Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1b56f9f81cd764…

MALICIOUS

PDF

91.0 KB Created: 2021-07-03 12:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aa89214a6b28dfacf8d8a339094e5ee5 SHA-1: 865e0183bf7a66e07a532beb19084a3fdd73ab47 SHA-256: 2c1b56f9f81cd76469492ca6540b404a1034443c77ca80e8e0cb34336acbdc46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=best+pool+players+in+the+world+2020 PDF link annotation
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/12639953218.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607443f865b0f---noreno.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ds4itge1plsjvro1umfjrq00m4/76259704121.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ol6hi3fqk4mofr3f2dgs3010a7/42773029304.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076e69347a90---94195909165.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/bituvotiduxojuvozamutit.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/sodakosoguno.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a7c88e1481cec6c45209c317acbc2436/dijajivelut.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76cbdb30e---30514708265.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/30049621059.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/zomavutus.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac145656ae---baponivosunos.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/jokujixuguridibizive.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/16626146490.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/39066333265.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/490dd7e0079731d5912d5817faea389a/38825114148.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/47353664654.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/15596138115.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/soxefexok.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/dbf59bdcc0bcd37a9905a1131ac77ad3/21337062770.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc26dad4b2---41274838913.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217a056f83---59182449492.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c871e85b644---64478020785.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e171da18d3---nifafatonaxasofegepekifam.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_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 10984 bytes
SHA-256: 5f4e691edd4441c995317a7ede45f1d2d0d23b967cedd867548035ce87ec536c
font_02_sfnt_off000130a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A8 17572 bytes
SHA-256: 1a9945463b5bb718b861b39e740eda47ae28fc6e0bfd1346405c37921ba2e74c

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