Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e171aebcc72b57d…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 06:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b00c46b2680b75cc225026f037db3c0 SHA-1: c02017d982f2509a5a3d8e93e14adac701684afe SHA-256: 0e171aebcc72b57d0e0edfe4b8bd9183f5c5bba13d457e375c7559897fd3db78
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://adabaskimerkezi.com/upload/file/sazixudukubome.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jiip6u3cnh0oc9lqhbgliq42sg/tuvujanugasatasoropowowug.pdfIn PDF document text
    • http://turnyras.lt/Files/file/dilok.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kevodukudib.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/fosajizobikumotumotete.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/23795918106.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/gesitijurewakoraganusa.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/92480029437.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/kh6n0hj4ut8h1ltpjrtc2mlf5u/mexukagodisubebivexorig.pdfIn PDF document text
    • http://learningkey.org/userfiles/12372076726.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44e75817d---bujufifenerado.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/salenuxojodi.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/37400877795.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/42827184908.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f14c2149861ed9e7fb08aa46b4156a87/gizakisizuvudixugibab.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/jozuxabupef.pdfIn PDF document text
    • http://a899.net/userfiles/file/lifumejepagak.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/674ca502c7a3e703c88bdec4c56a4332/tetarimofu.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/6383712968.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/abc16f10e43e1d443f4a85b2c864576f/79405494071.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fd97defb0896ea8ee64bedaff4a62c99/43426986393.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/5966h01g38grvtpdml5aqfai8s/24901398366.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7c397a17e---19909317111.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/eod513k0f5eeemledfoo1342op/473094639.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/4592126887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mariposa+acoustic+chordsPDF 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_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 10424 bytes
SHA-256: 65153577d8736083f2113768ddb7182a9a439bda26e65ac60a6c2201600c1897
font_02_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 19212 bytes
SHA-256: 429f2749458040aeb487e3a441bf90a9de2636fe2a25d8f346db7b5925f97143

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