Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde1fce8c682e85c…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 07:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d420295786b2dd7c277b74147a0a30c1 SHA-1: 6b3e96f37d1b5c781f445579e58e2225b4be783c SHA-256: dde1fce8c682e85c416ea85161bf1bb883299c6cbc4d33d7e4e6b087ac4a99a5
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links are likely intended to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6d61ecd1---77404062249.pdf In PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/xixagekenoma.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/91494821827.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c348570a53d---89279318473.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lsl8no271283opg1ve7lecm65e/53269072834.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021082504454473.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/77950613801.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/fivomebipinoromese.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/tikenanaj.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc9f5229a---gijobebavesikumoru.pdfIn PDF document text
    • https://linker.tw/files/25075609911.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/38587355488.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/rabazudejadozudapovoja.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/10528586212.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/9459611350.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9r97icjrb8md9uv8aqb6007dtn/45126125973.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/r74852srg612c1hhsblnntfdsd/nulokil.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/1304053511.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9b5aacbe---mogivawunogexabukaxuxeme.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/crep64kjm3iviomsen8j0jnvv0/54114577107.pdfIn PDF document text
    • https://aedwea.com/upload/foto/77130757813.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713dae82692---79927486854.pdfIn PDF document text
    • https://soechi.com/userfiles/file/77079934472.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872b768baf1---nawasopuxop.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f6fd5114be9---85098193691.pdfIn PDF document text
    • https://majubesar.com/contents//files/koworarezonato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=filesystem+in+linux+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C1 17184 bytes
SHA-256: 828d86a77dc9dc7cb08cb9a942379f402e9a038704cb6a7e8f8857d4cb36ee43
font_01_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 10572 bytes
SHA-256: d9e173ce0eafb67a85a2435ad9ae271c6ce7eb082bbd74652c25d8622027c640