Malicious PDF — malware analysis report

Static analysis result for SHA-256 e676c14edaeab0e4…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 23:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c3e4d711844c91fd6acc5327786e7d9 SHA-1: b728758252040293d5d7a3e2e458d61be56a2891 SHA-256: e676c14edaeab0e4df253fd95c57ccac9c631d762b084b2e88e2cbad14d4bc30
196 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=faringitis+en+ni%C3%B1os+pdf PDF link annotation
    • http://pensjonatagat.pl/userfiles/file/38908864215.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/tapoj.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/sotuvumafadekofikijike.pdfIn PDF document text
    • https://panama4d.com/contents//files/wobose.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/77288558010.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607225fe99f11---wasunukelabizizo.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/retupategabame.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/27e229acc87097c15a1263ca1a4650b6/lopemojosuforamivusa.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/4386246331.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/rabikitubo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/48195562564.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609af56d36a29---jesabegaxakeso.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c70dc2175ce---zitobup.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1bc968e28---gafigituwabam.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/71915991525.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/fopomefeleneze.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ff0807ef---rilosuw.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/65688893588.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/52862e8c0afa1ad48aefc7b3e173c2a1/loziz.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-12/20210612115747238308.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/povanotufeliv.pdfIn PDF document text
    • https://wita.lt/images/files/67372771880.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_off0000d3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 10812 bytes
SHA-256: cdbc180c96131c9e24234d2d0ab8d2e3833ce105f25f79d8738a82f74633a1f6
font_02_sfnt_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 17148 bytes
SHA-256: 50666c7571789004503c73e82c98f9878d473706a249955850d4aeb9823686ec

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