Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e13a688294a358d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 00:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d2faa67bde181d37bc8e120441bb73d4 SHA-1: 22437789abfa1a4e7ae4bd02bdae7dba16b99e9c SHA-256: 0e13a688294a358d94e2d0d49b875f3fcf84149237a5c3236b80b708e97b0b39
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains. This structure is characteristic of a link farm designed to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=bowman+heat+exchanger+manual PDF link annotation
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1dbb48e7---87092477996.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210809_224722.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/buruwin.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/86409645981.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/famaferu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3qtnlacrd5nubk031onalbeg07/21007744447.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0f278a5f8---rogixidirixugox.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210531015504.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/77194451010.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/41068662938.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4c84cafb---34603675877.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/c19pe1k49g5qfter1tgt30tjr4/gufiwuzonofavinebojisen.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f2d37abdf5eed99fd05a7ac872bb0348/munewamunuki.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607827e1a6f10---sidavanuna.pdfIn PDF document text
    • http://mopron.ru/upload/files/pimepipetunepunug.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/tikufinekigulowarofoxu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b438f3e1c7c6b9cb5cc9604c3d7aeece/86205048633.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/xefifuxevil.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60dec7db9af92.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/78388075107.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b1613b14dcb---baraguxoboguvosozu.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_off0000be46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 10756 bytes
SHA-256: 3ce16bda72f23bccd1e67277d5cd2dbe84582c43246d226dc25d93c73d83a9a2
font_02_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 16404 bytes
SHA-256: 9b32a6dae0ae931c2fa5ec98f86e0d7e614e09a695002ac27cb25f02d77834bd

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