Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e5ae4a64ce3cef…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 13:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c697676ae994565a137c18b24d46e39e SHA-1: 0289b3fb94cfb9f6d1ad2726f62d5c171cf0b370 SHA-256: 12e5ae4a64ce3cefc3893514d5943b31bfe0561f7f819eee6ab73175aaa5c1ab
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and other disposable hosting sites. These links likely serve as lures for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://beytarimcilik.com/admin/editor_resim/file/84627275189.pdf In PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6e654d7489d7f49b7f7c6bc91eedc224/24142078009.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b711c474ac---nupemavexurizonexepajimiz.pdfIn PDF document text
    • http://i-physiology.ru/upload/pomixoduwi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161098b1b7f408---basebopizodimitopiga.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/58687856772.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e0dff1f6d482b18042b8f9aa1399778/julipekibej.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/31d9d7a6c11ba3f3fd90f8795c412113/zasoxijekurutolulesula.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/10e7ede4260faabb77f1fcd97488bdd0/pipodopababuwarebala.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e291786146---pizeborulak.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/39490319822.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210807215110.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/22139623141.pdfIn PDF document text
    • http://mesterek.net/tmp/guzozawa.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e7bdc26d---72898266646.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd64851125---futulavuwotulew.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/nededisufid.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/64b9da90d8b02cc97d6be5351b05df03/65857802588.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da437b03a5---vosegok.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pebavuwanatixiduniwuxi.pdfIn PDF document text
    • https://pcetravel.com/files/file/sugolaguvubutef.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/jetusasofejomuralu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30815c636---renamobukopukumerupejufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=casio+fx-5800p+manualPDF 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_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 10920 bytes
SHA-256: 3ebd8995557ed9bcb114d4f4b4083182eea6d2ac26bdcf3a69226fc79851e58e
font_01_sfnt_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 18068 bytes
SHA-256: dd42af84744e839d4fa4512033a7db56b93c52d9a7c4be98aa0197ae81faddef
font_02_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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