Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc33688d57a73b7e…

MALICIOUS

PDF

121.2 KB Created: 2021-08-14 14:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95bb1598d1b3f7d16410fcdf5859ebb0 SHA-1: a108c710b5a3ac06fc70b61611a8976a657ef98b SHA-256: cc33688d57a73b7ebcfd2001c79b72435bbf0289bb164b5e5a444ac9be38309f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, forming a link farm. While no scripts were extracted, the structure and URL patterns suggest this document is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://ahkkpcm.org/userfiles/bizoja.pdf In PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/kojen.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a60c4929143---dijujinaxam.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609102647d5e3---konawufijavejuzorojigetuf.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/59732379010.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/81083057413.pdfIn PDF document text
    • https://nomortiga.com/contents//files/61475830316.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/52009425823.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/gelanokaduli.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/taragaladirunubekudovuzet.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0b7de9c3b2f76b4c4f8ccfba8d728675/40832498171.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3972f0104d---jinatomizegotoronigo.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/sanunuto.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95855135841.pdfIn PDF document text
    • https://digireg.pl/upload/nijemabevogefodizar.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/tosimadiwejotumub.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf073349b---gokajeraduke.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9b8a6d5cc9a900036f3eccf516300202/gekax.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/gexeketufuzusedo.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/g6agcm2iqs5hp9hf469g1ga636/xuzil.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/39444613160.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1c4f77bdc---xexixogakatutanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=exerc%C3%ADcios+resolvidos+de+precipita%C3%A7%C3%A3o+hidrologiaPDF 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_off00017069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17069 20112 bytes
SHA-256: 0e0a150483e331205dd3e5823828051b778d06e133645f5b4cf89178d9e95945
font_01_sfnt_off0001a225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A225 11364 bytes
SHA-256: 1504103d4a1146f94057ab12de0130f71160f1ae13dccd1252b52e8fbe982840
font_02_sfnt_off0001bc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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