Malicious PDF — malware analysis report

Static analysis result for SHA-256 767e9e2aeb9e2feb…

MALICIOUS

PDF

114.7 KB Created: 2021-09-03 18:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 734c3e285b5ac2508e847796599e617d SHA-1: fb1a3c797d3e8f53cabda5fd8924e8a67d5679a5 SHA-256: 767e9e2aeb9e2feb6bc5d4c2afc4dfe3c438b672a426caadc6160cc8f4039b91
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files or redirect users to phishing pages. The ML classifier strongly indicated maliciousness, and the structure aligns with SEO poisoning or malicious content distribution tactics. No scripts were extracted, but the presence of numerous external links on compromised infrastructure is a high-confidence indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 5

  • 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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ec8e910013408b989d7d98f66bae0d11/semirenite.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9c130831---sulazafodopukafuj.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/vikadi.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/90369925574.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/71425612841.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///famodolinegezu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/bacce3aaa4b536b414aa9da8e442ba87/gadepefejixasetesi.pdfIn PDF document text
    • https://dhesient.com/media/zeligasodivilorobop.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/35741345360.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/podidipuke.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072da218e2e2---6309493525.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/5280fdfb65ad2b418130894c0af4fa8b/dagimuxojuvomuti.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8f05b124---11664641461.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/blejen1t31p9nkmqbc3p7bu0e9/kexewujojefake.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0aa6e41c083411bc896d8205c2d116e5/metetikebumivivikuze.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b783c4ac5c0---29892871107.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/5457632032.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/jexezegufazujibog.pdfIn PDF document text
    • http://lg-palette.com/upload/files/gizub.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/9956321155.pdfIn PDF document text
    • http://vangphugia.com/userfiles/file/fifade.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/28258946214.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/41486243041.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/zuxexosot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=leyla+ile+mecnun+hikayesi+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014216.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14216 25716 bytes
SHA-256: d324abd140a0115978de937f8fbfd754b0a4d9d2dc44b4b48b2b114813ad080e
font_00_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 10832 bytes
SHA-256: 8ae68c619d9e3752782695140b889de4183f592db978306a7100922a316a6c3f
font_02_sfnt_off00016f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18769 21744 bytes
SHA-256: 6b6b53a2bfb6e69ef87128ea84a1f41fa7f63a3aedffc0eae46971d549fb19b2