Malicious PDF — malware analysis report

Static analysis result for SHA-256 781558dfa8040b91…

MALICIOUS

PDF

80.9 KB Created: 2021-06-25 21:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: fb59df6afc9aecaa04693f39e241e29c SHA-1: d6466e35c8c96c42f6d6480c762327bd6e08f117 SHA-256: 781558dfa8040b91865df1cdef89b6f7927ee02df0d364ceaed93b48f35948b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple link farms suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://laborke.ru/uplcv?utm_term=java+quiz+and+answers PDF link annotation
    • http://alituncer.com/userfiles/file/tozagawufopomovugofovoti.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/junuwajizabatokukituriv.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/57056263175.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a93b756b71b---84347312879.pdfIn PDF document text
    • http://usmleworkout.com/files/file/nugek.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/34270740324.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/53587663647.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/sabuwogizowutotuvobuwixu.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/1180432998.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cd89baa31---66597686936.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/460fa54ae9b60b297ad54760599f3c8a/xijewekotifo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2rjvvtde318rak10u3jcuh2ub1/zikadixolagebuj.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/maxunalidu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb774d4e94---manonibotirosanakifuse.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/4icqgdqjil7csvpgmq1q4jm7ng/427910309.pdfIn PDF document text
    • http://uci.ir/userfiles/file/56536324189.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9e66280f6---jonekuv.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89380a701---sutodewatebu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2761557414---xesegafesimagunibawofe.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/2f1pkdgu9uacb2tspi6qmu1qa6/dukikejutobimikazis.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efabaf21fc---japepusolemiponijet.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/be395270189c4b2286ec834db9996b0d/lokibufavabaxovora.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3dafed858a36e9329ced99bfbe7b99cb/15666651624.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b8f3a4a49---vowubikuzowokezibegirofev.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/uckobbsa91f0n2cbltokfgmt4l/67364865590.pdfIn PDF document text
    • 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_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 17444 bytes
SHA-256: 2ff71237f138eaf6c4886232ee0aefdb00317508451ccbaabe0be10b89ae8a91
font_02_sfnt_off00011d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 10424 bytes
SHA-256: ab7dc210de61e03d3523479e9eef02ed3497390054d038c646f079b03ae43c05

Open this report in the interactive analyzer, or submit your own file for analysis.