Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78a9383a99792b7…

MALICIOUS

PDF

71.7 KB Created: 2021-05-10 11:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e96c2f18d434b6496c351cd5fe863db9 SHA-1: 92386dd22ee92c8db1975b148a11c3ef7221a280 SHA-256: a78a9383a99792b734ec76f2d1363ce06485e9d4b98080eab8151e6c1e7cff35
164 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress upload storage locations, suggesting an attempt to distribute malicious content or conduct phishing. The presence of urgency language further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092038ade651---3131136407.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/7af3f396044268303f1586c6429cb062/rozel.pdf
    • http://matstravel.ru/userfiles/file/83128162585.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02d57c71f---42933760915.pdf
    • http://sun-eko.eu/files/file/tusidobewonotarewetep.pdf
    • http://ztkammer.at/uploads/file/tebakujudegag.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/003d6d40b4b87793b172fd34e545f4aa/zakotejabojap.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d687a063ab7fed226d49ad22401a7246/98614713576.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087f957dd0f8---45920660333.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b9babb5ea57a3b4ca72da00abe3118a5/88868935808.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef23342dc---litafef.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/sv1fpovdd4hbt69m9ch5lb5e4v/xoxobakabamuvovelalu.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/eiq2d7ovdbugm3nsju1mrfdlp5/fugofudi.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081005706ed8---jusituvitotetana.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qm0mro9vd1u3jupdojofq1kblj/manupusanawa.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160805ff15c36d---52336351442.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae48e907a---ropejebolabitaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bugaboo+cameleon+3+high+performance+rain+cover
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ea.bin
f2663dc3b9303429a2f853bcb53a0ebb53db149da117cb6b68cf412a72d37ca5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 5664 bytes
font_01_sfnt_off0000ec17.bin
88a803e50122a8e5e98bc2f2b3839b947cb0ef7297a6b4160c8d73207aa1477f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 10856 bytes