Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d16b222b9decc7a…

MALICIOUS

PDF

89.4 KB Created: 2021-07-05 18:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 042aaee1348290386059a0b14183ce72 SHA-1: bae0c9882c0128a31a70a3607ba977c5cf4f1a83 SHA-256: 9d16b222b9decc7a60bd8369ffac5cdae367f80d13396454a7eee5cd92e76802
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://feach.ie/images/uploads/file/pesavexinuxeguzu.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97dad762c0---varatogu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/77511470984.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2pnmoh23cdpt91ulotcc1j7pf2/33748259079.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607072c8aef3a---86374590727.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/vakofaxi.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/61543507773.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/16938816750.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/88523648772.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/k3uc8sjnfdejvadh6l133boku3/41645329267.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/22hs50j46e4i0kca75t3910820/nutixugobadepe.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/30521890909.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b5df94acbe1d212b9265da5743fecd3b/zagajomebisukapelofaw.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2fs64t1dbevccinalglh7ur6h3/28861952559.pdfIn PDF document text
    • https://arerp.kr/data/file///vexakizudukij.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/velazagitefaloledewivibu.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/norokiwitujomevivixofan.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501225007390220.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9a93fc34---50420210236.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d789d55c---kopetuso.pdfIn PDF document text
    • http://446888.top/userfiles/file/18689648139.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/tinasapodixufu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b24c0f3407---96405032295.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/r8eeb5ejlqr1n7honmcq4bbi34/zupuvuzub.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0565km151tf1oolnh7mg9id175/lunivodusanefizurekipox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sublimed+sulphur+meaningPDF 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_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 10936 bytes
SHA-256: a4e8115631c997a6803e4b6466a155abc20c753b1eb0a541e2e2ba6abe8dcdfa
font_02_sfnt_off000120eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 22036 bytes
SHA-256: 7c50ae396a3e397dcdd92f5c573c61614195d7b53e4d6db12550068bf038f5c2