Malicious PDF — malware analysis report

Static analysis result for SHA-256 869c43970b1bcc5d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 11:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff636fe68751d3cd812d075efab2d826 SHA-1: 9ef5133aeb93c666ef3d957124bf716f70ec3210 SHA-256: 869c43970b1bcc5deb793498f2138796b6ce05e0aee4e5f61ee2dc0546069656
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medianet2000.net/amm_prod/image_news_popup/file/47095202669.pdf In PDF document text
    • http://billedbutikken.dk/articlefiles/file/kebisodoxikajipulexe.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/motever.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c583fc1ca86---mevunukiletofin.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/24e34d4defcdcac1838f4649c6e79e20/30052320334.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/23aa774faab4ca551d82b07f4b10db5f/muvirilokabaj.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/mexumusizarufejuba.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/52643248478.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210812025322.pdfIn PDF document text
    • http://ewtch.com/upload/files/zodovamivepuf.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098390de04a5---logexosobevonanarowogafo.pdfIn PDF document text
    • http://benetalent.com/upload/files/95202323212.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/55924209415.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/02a0a2af828616663654fe261ad1d1d7/nodalipo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce388f1bc2---74672814103.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd678aa3ea---3964244460.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad7d90d0e---safipat.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pib1m0nl7c7jkig6qi1sq5uss6/78921506597.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/sagixugisunosekaf.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/kukag.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/pewevadamo.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/lazij.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ucbja3fnp01erkd66b6360s5mb/38208537477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=identidades+trigonometricas+angulo+doble+ejercicios+resueltos+pdfPDF 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_off0000b671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB671 16844 bytes
SHA-256: 0b8d42df3f90ae1ce7cd30fe317afbae3f5db668a68b3554cc126647f27f75e6
font_01_sfnt_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 11284 bytes
SHA-256: b30bef210126c8ddf9f0b191b158d625b4ee94bcd9387548f5a40851a64ad99b