Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc961def5e6e20b6…

MALICIOUS

PDF

93.9 KB Created: 2021-09-04 13:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf9f88b6df861fe0ac3bd3b1947ed03a SHA-1: 628ff3546e7c9903864c274b2a96842c303de3f2 SHA-256: bc961def5e6e20b687884af7f01378f205ece2c8b2e6c4d9b76163c15b2b985f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The PDF_RANDOM_URL_LINK heuristic specifically highlights a link to a PDF hosted on algorithmically-generated domains, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dea53af50---tipawotozazuneruneju.pdf In PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608750d8d0098---vugesuwo.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/savow.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/87867324856.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210821_377FDAA388B8800D.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1e3f24e5dd114e883ea9ad08535afc6e/36592472257.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/95cl1br7burvr995bhea3fr3jd/67986620334.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/bd7a79d9623a99756b8ebf1fe63cee97/zeluvutezirebafo.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f4a093a15fb402518054516874f5823e/wemuze.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o003ph62sbfef3kanc8ghe66j4/35374383528.pdfIn PDF document text
    • https://rjpexport.com/files/lowevevixedavimexafa.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/2404513192.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608466ee218e5---lirigasamefenowuzuv.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161011fe1396be---2790726092.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb3ea62fa1---61482948622.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/38459095288.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/rijimefulizet.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/jinukigezasegojexigivax.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/82194040242.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d41fa856902---fonefabijesolebosum.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ecdf45c87---2894723986.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/41375650366.pdfIn PDF document text
    • http://ruihuitax.com/files/file/95691660570.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/136kt6rcfjvkrpmpl37gehrstr/68699548754.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/matevusukitoboluzobuw.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bbc3158bf81d5b880fe54c2d394a5b08/tabizukorefopelusija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=laboratory+equipment+worksheet+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_off000107c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 18120 bytes
SHA-256: bf7d165832a760db76ddd87a93362036ec0c4658368c62710f04ee7c339cd12c
font_01_sfnt_off00013723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13723 11352 bytes
SHA-256: 115e34543038f1c6d014df2f219f46b8790e626768ad9318143f61d0ab06b132
font_02_sfnt_off0001515a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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