Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cfc853e5b2ec73…

MALICIOUS

PDF

90.4 KB Created: 2021-09-01 17:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f611f787d44c1e7c91125adfc68268de SHA-1: 56021b31f8c3353c788c61d50587939b2735bd3f SHA-256: 21cfc853e5b2ec73f34641afa9c78976c8e9043692baeb969549fcc7857817e2
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of these links suggests the document is designed to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=core+competencies+questions+and+answers PDF link annotation
    • http://volareinmongolfiera.it/userfiles/files/20511992628.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/b2c4f7ff437d15d92c7da533a9899ad8/55026310415.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7a17eebfd---latufufaxarer.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/semewetikasekafuxis.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vajivaruja.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b2615a4f8---xubiduroxef.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/fisiwojevixuzolovagelofa.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/b7sq70doeo94j68scg8teu9j29/90233185813.pdfIn PDF document text
    • https://tipresentoio.it/images/file/37302594006.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/286c0c55ea3406c5c95b1b2e6df4d7f0/pivam.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/dd2380276f410ff759b02890cb111e92/67201947106.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d19655c1---ximuwivene.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/52392783881.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608394602e1d4---goxuluzopew.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/tebaluxotiz.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/sazixukiregoxij.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/smb4l0dgd9conp295o2hjcdaf2/raxonijekonosewubepu.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/pawuzom.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qkbvo2n9tf53deas5ir9mfpvjm/27714039469.pdfIn PDF document text
    • http://samtekelektrik.com/files/99909682910.pdfIn PDF document text
    • http://getem.pl/files/file/lunasukoxiterulutuweruk.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/40254979173.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161040a22ef055---redaguwosevaxoruberijome.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_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 17872 bytes
SHA-256: b1fbaff105b5164484bdbbd4474a838cb66a3ab72da1576ff24067e8cc805966
font_01_sfnt_off000129a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A9 10992 bytes
SHA-256: e200095e2973fe8b0e26e8bf996075b962c4605be44010680c12a1dc01d768d4
font_02_sfnt_off00014313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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