Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d19aacf459e37d9…

MALICIOUS

PDF

86.4 KB Created: 2021-06-30 06:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e6a6759187676ae36e8555122ce1b08f SHA-1: 70d60e8447277fdd6be06ed0de6a37354efc0680 SHA-256: 3d19aacf459e37d9bdbc11ea34779740ceb5a4b97c626893ebecfabdafe03995
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in URLs suggest an attempt to create a link farm for SEO manipulation or to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://krisoc.ru/uplcv?utm_term=contractor+meaning+in+english PDF link annotation
    • https://dm288.rs/slicice/file/43575982083.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afe66c8a26c---sobilawidejufovatu.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/wadakowepupusunerepa.pdfIn PDF document text
    • http://hasyo.net/files/file/powaduwolasuwor.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc9edd7434---xetumatixeguraras.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/74fffdcc8670ac4bb717967a504fa42a/53772433392.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/pudelotasotelesiteduban.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7b7e99cce3a96b9e5b024838b1807b56/luziwuvufal.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160801295354fa---50886678604.pdfIn PDF document text
    • http://www.celso.org/download/mijukitodobalozasonokix.pdfIn PDF document text
    • http://apvn.info/userfiles/file/fomafutubemetazavig.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/1612001264.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725727e0adf---wubonajive.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a82f53aeda6ab5def6224204352ca4c4/20709745377.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/53d917d089279f4335228e20b1433b02/56037811905.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/94d304b51262b0e4b6e3f92095f210bb/ramifiz.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4863abb82---ruwusobakepa.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c82fc9d03---pabitajiralenej.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/53e5a85ad9de78e9c89a5ebe4eb9eebc/soledogurefilemizeborasoj.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/dd862da950f6c11d639c552e731eb527/63992421987.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/92975585840.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb03abea810---66498574554.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/19980136181.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_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 10708 bytes
SHA-256: d08c23cb00e8eb897100ee27ce79eca9fd46a640d136f3faced629149c65b5fd
font_01_sfnt_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 16948 bytes
SHA-256: ef49befa6acace4c38acd0f12264064f851a2d5d0417044371756ee089a91cbb
font_02_sfnt_off00013489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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