Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be5fef80c7e56b2…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 15:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66c15bd91609f7d8c6cd5b09459bc0de SHA-1: 169f9ba166cf0bbdf87493145cd66f2756d9bee1 SHA-256: 0be5fef80c7e56b2fa7f9f9b2f701549f8660c76a1ef1e6eaafb9e198bbe93bc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of domains, many of which are associated with compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially compromised or disposable infrastructure supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://irlanc.ru/uplcv?utm_term=foundry+ecocer+srl PDF link annotation
    • https://fcksa.com/ckfinder/userfiles/files/debijufifoje.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/fasonemusuvutere.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16080279babdbc---8450038633.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/14627078013.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hcdo7g1dfs6fr5iukk2j5jo8hs/pusekofa.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/70917419609.pdfIn PDF document text
    • http://bjjiffy.com/upload/zojelidewatamukiwejutob.pdfIn PDF document text
    • https://langumeistras.lt/i/File/26564918573.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/wifaxirararumem.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f837409e6078d654a83c2d5e7b96a1b7/renajamofakefelakaduzese.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa891b24a5f---95346324066.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8f5890883682a26f9f14460b57a7f464/siligik.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125e91d63e15---48943572185.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c964c5806---19580782007.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/76761132391.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c7d29f627---21713709584.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/83352475479.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/82613881208.pdfIn PDF document text
    • http://elpijisystem.com/file/20847555643.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/zepuvisuzidas.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5f0c9cf64---xivakesukagobekeludibitup.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/50759514300.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_off0000ca32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA32 10200 bytes
SHA-256: f2d4d819c3b908ba673102d45d57c94152c8d1a39f03c56049bca2175d455692
font_01_sfnt_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 18064 bytes
SHA-256: c3a954a2ef81e36f08b7012be0ad81e2d79b78d52a81afbb8fbe29bd2a0ef8aa

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