Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72a7c4a0c19cf44…

MALICIOUS

PDF

72.7 KB Created: 2021-09-01 13:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: edc3c25e27bc27034ea0ee21c1c5f2b8 SHA-1: be74ae3acc9d4169fbcd7babe91221db5aa7fb5c SHA-256: c72a7c4a0c19cf445dc793ca815174b7fa5ccdc22aea67e7f3c8f72c928676aa
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, directing users to various compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=name+any+two+single+user+operating+system+software PDF link annotation
    • https://soechi.com/userfiles/file/ziwutupelagilavovewobof.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/eabc8ea8f6e694ba67eb98e605aac807/gamub.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/bexobobixagajuturefowo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd9849844---bategamimowugivesobo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/35ff33ed70ee7da9f40cc32efd19a8f2/karezuvagedoxosikujuxefok.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/85502354869.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/122drujc1gkc988jd5vtdc9g58/93149526721.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/75633663198.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba89d1f56---zadexifodegenikemorolu.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/3261176377.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210808063617108.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1230e90bfb47fff10db242fcc411e934/nebuv.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/48842961724.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f474814f6---vusojituxinasojumojosewa.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b2184f878bc0637f349a08191d21ea0/26336103904.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607831acc03f3---doviwepep.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/tdc29uqe4n2mneqkr0rjekdifc/74299954928.pdfIn PDF document text
    • http://www.toptehnik.si/images/bipezuwuzojotuzedenunevad.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/af32fa4bf5ed522324c5604ab8a66cdc/piwutemobazovukopo.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/54616485173.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d93f2051---92024752517.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac1d3b42d8---73204809836.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/90170255879.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/pezujeropomusiwitipalixu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/41330c436381d15c61ca28bf1ffbbff7/30104036633.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_off0000bacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACF 10976 bytes
SHA-256: a157d05fe7809b0c929e2783c230502db3efab3b5514ffa132e5607294d24811
font_01_sfnt_off0000d45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 15668 bytes
SHA-256: 42579c67d95f989df64360caf16bc0d16f9afadbf225b75cfe26c046ceee3e73
font_02_sfnt_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1