Malicious PDF — malware analysis report

Static analysis result for SHA-256 91247f0b9830f837…

MALICIOUS

PDF

102.6 KB Created: 2021-07-18 12:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57434a5d2bbcbaef66f3dff8de14c432 SHA-1: 38e0f8f60da37e8e4ef5aa5c86169f9f4d52aff4 SHA-256: 91247f0b9830f837808288e81909ec70ab99922fb6b8e860515ad8d8e2e61d62
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of these links and the overall structure strongly align with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac34bee2a4f---99073231077.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4adb7cd2---16741363402.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f5531e1a---tuniviz.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607366c86cf26---9552453129.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/naxafivuwuxadorasixiniwu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/48213488143.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/tikorukewudabubidor.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a16b5271dc7---84606277595.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2774d1ed8---43532486602.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/auka5251v69rjqf4lvfhoorr01/sunaxunedapo.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/sonexugivinuwukafofu.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/gadako.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3d3355ef2---zotumojedolaxijafexa.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/64457740829.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c49b0753ce7---pujinexibexufudedifudi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec02f11a4---filexobuno.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/maritobari.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/rarowisolugug.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/34837097122.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/pulemiwizamosukidixo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b853c0ac1a---surolojegipojokevides.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092400f4fd8b---gofilupivijuzoza.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/vubesufob.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbff3c68f6---lewelamefodafikudebinoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=animal+cell+picture+with+labeled+partsPDF 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_off00013030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 16740 bytes
SHA-256: 853981e4aee0b55a421d622ed55e116026e1f684ce68faf5302ab303ea2a7155
font_01_sfnt_off00015bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000173db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173DB 10964 bytes
SHA-256: 3d39e98e3011649f809183c24c348ccde79022eb63ff2985f0eb07df5552e1d3

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