Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1187a1cb785d29…

MALICIOUS

PDF

83.6 KB Created: 2021-08-25 22:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 975e43ca5e27e6734d137a683349c17a SHA-1: 826cf68717c6d6c537211eb011d3bbde08888b7f SHA-256: 8c1187a1cb785d2998b0401b7ff6ff6932cc68ba44875871eaaf8c8e42f29fe5
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links pointing to websites hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of a link farm on disposable hosting further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f620d27575---semunarosedole.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d7d3e357db9ed211da42a73b907d7212/lipagafo.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/njoor83fhrl3fmi4t3opt2j7up/mepidusatimosifazux.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/44609724306.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/tedelapodilakameforag.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/7ae129c2b0d0ade98206240a8b42fa76/64122096932.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/12352206347.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f19e193da---fabubowiwanix.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9123239b87---75348684572.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/96396265547.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ffe0ecf4dd84da09f010d9aa0fc86ef4/fidilotufapedamanaj.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090a695d4c4c---12351144640.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wawep.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882afc4659---rosuvevegurefofujofedex.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/simewisatonoruxipuw.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/80179034708.pdfIn PDF document text
    • http://ridendo.cz/files/file/kawulazapopupo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ddafb376b97---gimakudovapata.pdfIn PDF document text
    • http://vanhacollection.com/images/files/zinuzixinaboxinovege.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/25378001607.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/bepanujujipoj.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff30f13bff8---10057496079.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b63d479a4---zemojufoliloporebawubej.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/kijinedadokatugili.pdfIn PDF document text
    • https://network-italia.it/file/vejafizikirujobubebekobet.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8b418c6a8ba30c76e4397f663bf5d5d9/pixusigazixexesub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+pdf+to+excel+softwarePDF 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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 16724 bytes
SHA-256: b152139c4712e4821a6250c95835721677a3489a8cfc209081034336d9c8f8b0
font_02_sfnt_off00012597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 10660 bytes
SHA-256: b25553d95888e2044bc7c70e8a2630b95d7bb60e9a594c5d532e20266764e81c