Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce654a612ba684e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 11:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 64658a1eaf3ea2c51f66a605db7cf23b SHA-1: c734529b5bdfa971797555e407aefae7c1fffa3a SHA-256: 8ce654a612ba684ebd316f05bfece307672c282bbefaca71b4b67a93afe43a85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this PDF is a link farm designed to redirect users, with ClamAV identifying it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://krisoc.ru/uplcv?utm_term=arban+trumpet+pdf PDF link annotation
    • http://haohanlegend.com/Uploadfiles/files/tilugu.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/1959720372.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/tosunavukegupevanatodoga.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/10605212059.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/fopitibimafenirekab.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/43364166429.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/vobepasazefinofeles.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/netafulofezepaligupemul.pdfIn PDF document text
    • http://wixoon.hu/upload/file/siwizedeku.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338eedbcdf5---zaretiwawod.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/tonago.pdfIn PDF document text
    • http://wych123.com/upload/files/74120203699.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/zuxefaketefar.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/maliminujomopumagisu.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/21253721532.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b13c23db---67219104892.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/lasuxosunij.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614388e99ade0---dojoxutezumo.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/37505797456.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/98294994705.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/bavodesudaketima.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/siwibabolaxunevidufi.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/powuramolidorerezinerugab.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/bopenudonu.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/xedovamixavaji.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/buvaxopuritizepujozaxav.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_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 10456 bytes
SHA-256: bce9d1953fbd03b2437a8b5a2bb19054c337aa9f47f30a0021bc70213c76b9f3
font_01_sfnt_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 19544 bytes
SHA-256: a74fed3557c9f77abfea9296f271c91833b5c99465fb6722d670aa2fc10314a7

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