Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9c05700ceafe8f…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 11:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: babdbbe16b608e72c39c0e0e59d94759 SHA-1: 06bdad233ae59c02ebfc08c0ab4b16fa854ea2a5 SHA-256: 1b9c05700ceafe8fe048e73ae1e7d2280aaa9c3bc85b65e7e4be5d45d395fe6c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/uplcv?utm_term=teks+pidato+perpisahan+kelas+6+pdf PDF link annotation
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/221159e43e90f7d1275812f09cf502e4/14007990698.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/3063537929.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ad056ed949ffa203fff9dcb335a57ebd/finilululixipovexa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b6db63b7e---30717203743.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f438d72eea---zonaxuvenez.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210708_32D0023A212DFCAA.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/niwosepoketebu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06e94b845---7576927583.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/uu1drc6bqp480q147co10aaqjv/62994574700.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cf432bcdd---33698734960.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/46075988675.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/robaxigi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce99de4a06---82070371949.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/10055223563.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/59015786064.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hqfi5ib5uimcop6tnje0pacp7s/xuximal.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/lobowemixudoxumadimebo.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/84658239605.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f0c2dc9d---45890919327.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_off0000cd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD68 16924 bytes
SHA-256: 2f285e28c631253efbf520ed4d01493960ec8e9d5ebfef96cb5bab9a6fb87dd5
font_01_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 10820 bytes
SHA-256: f601cc06075166f39c3ddacfad1984eec4a76cc1d33aec291535ec75100b910b
font_02_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1