Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1a656e5dc650fc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 07:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f2e5930e33cb7b4d3ed2478f01b63fe SHA-1: 85d1f150f62a33cb3efce15e67457c599d14aa4d SHA-256: 7f1a656e5dc650fce83e966a398bdba3599ee2fb672fe7f1de0d64699c18462e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=recurrence+solver+step+by+step PDF link annotation
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c17414c39---84326665918.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/parosatavodoweboromakero.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/99165102070.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/bowonozazowajofugejugojob.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/lewasav.pdfIn PDF document text
    • http://sun-eko.eu/files/file/vuvefubupeveromo.pdfIn PDF document text
    • https://icbacademy.com/upload/files/ledemavigenariwumate.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/23254745240.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096abd9ac165---6082335348.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/masefonafa.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/bafebidowefese.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/29730987567.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/2234682826.pdfIn PDF document text
    • http://renovator.cz/files/file/23366037119.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/36156154232.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ae4e305b92c074bbf3ab680931a4b36f/rubanosi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bda2759aeca---nunulibozelufovivefal.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/356d60677678484c6d570b1c1906e164/fukadetadisexojezof.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0eae964b7f4e8dafd12093f0eb37ae04/daviwowux.pdfIn PDF document text
    • http://henca.com/files/details/file/bonubo.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4en13k5sedium06vd58jjbv3od/gumoxigaziru.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609416e6d3f91---dedakezubex.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/xizuvoneluboralereluxori.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/48225988738.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_off0000d50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 10580 bytes
SHA-256: 48b059057d5b292134fc3395f8620c5743f70a68ecf37cecec43fe006b85f481
font_01_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 19848 bytes
SHA-256: 15b13f44323c72e077be30a0bb5aac8d167fe886e5eb947f0f679feb2c40d8da

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