Malicious PDF — malware analysis report

Static analysis result for SHA-256 617dea7a8bfd7c11…

MALICIOUS

PDF

90.7 KB Created: 2021-07-03 09:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 79dc4b21666c8cae0d9f54919190c5d7 SHA-1: 179ab8f33dcd32ddd76b6671a50c7f1ccd407b06 SHA-256: 617dea7a8bfd7c113fe7cd37acc5a23d31a5fbc9def2e3b002b61eccb7f9241d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=how+to+keep+baby+goats+warm+in+winter PDF link annotation
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080b7857e0d8---levuteniwibuzabebe.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/826baa1e486fde845663df9aa45b3ba9/tufipotex.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d8458cde0---gamajilor.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/51da68238003e6980b524abd745e3b34/65725447887.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/pabulegerewumovuzez.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/bemodefasutojoz.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbdca09565---duxifimabenifexuwuki.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/mopikorebepo.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/v0q2m72j8a780madb2f76mbt63/vakaxona.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/19670576.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/90346738234.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb054f5dd---9865581210.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e8c587f4fa7b8e78fd72156094ff55b9/kitamurorewetekipobonu.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b94e0710e060d1e6457ce79bbeb00edd/vesadurudirajebesilaw.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/221d723f45e03cd65c9aab7e8700e812/23718330296.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/52807fe1c184f9b5cc026f05eaf6d4c5/97964094827.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/dagewefajanalidena.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d389dd602e---daguzuxaxusadogotiralot.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/52886765255.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/16693212275.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/df35fn1ol4aca243o42j4n45sb/monegelupuwesoku.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/97108819908.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/mesovelizu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-3/20210503095911538241.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/94057225190.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_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 17168 bytes
SHA-256: 84b3e35feefd8ce499959741d41bda35e736f0ff19144093c4f3dc00c524d518
font_02_sfnt_off0001425b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425B 10972 bytes
SHA-256: 27eb149c806c5657894c1ad615ab4e55625feef8348146e856f47994d4a71318

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