Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed822e788fcb361…

MALICIOUS

PDF

86.2 KB Created: 2021-08-13 09:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae27219360f887822a177ae05b5ea093 SHA-1: d4740369c3cc8790450b4571b139b59aac061ccb SHA-256: eed822e788fcb3613dd0ddebaf2d31a688a60690d5578c5a0936eb1b480a4347
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate these links are often hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=exercices+propri%C3%A9t%C3%A9+droites+parall%C3%A8les+et+perpendiculaires+6eme+pdf PDF link annotation
    • http://tuttotop.com/userfiles/files/14780617219.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/hovvsopjq389ederdp9s0e8tft/66615892683.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/88715784533.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/juwiran.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/narav.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/14ebf3013c2c4fbcebee65ebdd670d0f/6186508300.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/rerawawole.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ujbad2698pd6jkbfos9489d7n4/kopavazodejulisusaj.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/rafuvuterazamalupasaxi.pdfIn PDF document text
    • https://kenadong.com/contents//files/84558610211.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcba48034b9---17418467683.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/29926704293.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/78938195781.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/porifubule.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/19007343537.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/posememifodawuboxino.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/momawekapazuwuzanuzomufi.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/58993193164.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd3b4635e---senipu.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210725_3B6A1760CF1F7F1D.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076064d8a14f---93062143994.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/81124752576.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/kedizalasofusaxoxesib.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/lojisilegosinuleradar.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/hdo6iggrchmgdr64fgcl1is2ao/genowakan.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_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 18216 bytes
SHA-256: 860de7834a45234a2eb6d29f332e34d3771532290c1a026f26766598c029dd47
font_01_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 11444 bytes
SHA-256: 9e22bbb0e2879bcaae290d6db42d7554689c59fe58d93e475746bf6b045722bd

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