Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fad0c998f9b6832…

MALICIOUS

PDF

73.3 KB Created: 2021-09-10 23:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ded3e2bccf2ec315001941687b5aebf1 SHA-1: 81616cbb18076605cc0636ef8b6aa25ec9dd230d SHA-256: 5fad0c998f9b68325c3e7d9a8f51573cc87eb92a8e63f6938151dfbf4870ccc8
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to potentially compromised WordPress upload storage and other unknown domains. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://indicaperu.com/userfiles/file/43088460820.pdf In PDF document text
    • http://pushgroup.lv/userfiles/files/44881507783.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/dagorofosebuxi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xozudolizexekupumaro.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/jarazixedazizodire.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/88905151192.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/70081828284.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/3719796852.pdfIn PDF document text
    • http://imaginove.eu/data/Files/15928478149.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/nirojiwazuletumezu.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/sekigijoxibizotunilalal.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/gukajomur.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/pokusodo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133844c1d66e---32778027264.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/moduvoguduxud.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a42589ca0---jirisapi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161330efcb3d52---98918979584.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/rexupaz.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/95518148573.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/71401416848.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/2991701879.pdfIn PDF document text
    • http://balone.net/_upload/file///xuvurowedegulomarat.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/42739462795.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/58818504486.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/95929732526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+sopranos+season+4+123moviesPDF 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_off0000bda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 10824 bytes
SHA-256: f7873c0d7b0906618be7a337cde06860c4bb8a12af5a8d1de48a277a9500bc28
font_02_sfnt_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 15928 bytes
SHA-256: 04cfeca3c15347c5b83d705e3802e4935bfba63e0748aa1fd3da5a671bc36531

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