Malicious PDF — malware analysis report

Static analysis result for SHA-256 2538ee759153c6ea…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 18:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f143cd84a622716e86349c531b5ead9 SHA-1: 51a1b1408f1e4178a46f9a98835236771b7129d8 SHA-256: 2538ee759153c6eaedd2cbe6c36b44bbd7d0f0c16859fab3ad4fadafc8fdbcdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://ketchas.ru/uplcv?utm_term=wavelab+6+manual+espa%C3%B1ol PDF link annotation
    • https://tessuno.com/upload/files/60cf39c330747.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/pitodikol.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/64248737376.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/778cf8e4383f7ef98689340ab4b99329/vobojotepumojorimimikodow.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9ff3ade48---88718795624.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/31448284046.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8d125ca70bb376e8194ba80b9ba0e12b/72023049154.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2cbab65dab5982e3f0ced36670799609/xelas.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bcb0eabd6---watetegidako.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613517d61efbb---pujuwubujuxokoxuw.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c2fc9dbfabf9e2fddac2f9ce057301e1/tufedizitivisemumudewos.pdfIn PDF document text
    • http://reunionclass.com/clients/7469/File/tobowuvejamesem.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/34fc3696b8deb052fee2ebd9274d9a22/16817141949.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/vawozakelewasibajerol.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wekol.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f082249a0e---13993917295.pdfIn PDF document text
    • http://apart1day.ru/file/vodosaviwun.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608956494999d---78225223503.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/56958685263.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b260533728a20f1e358eeec285ed0b30/74512617308.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/65426566560.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/54175110767.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_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 20288 bytes
SHA-256: 705f0bf9ae6a7b0a31e92d2c015d017fa8270b0d5ea8500d183e21cf5b93f839
font_02_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 10796 bytes
SHA-256: c6360c955990d621fb1944993967e19b4d4bcfbb38928a296edd055f25d98c26

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