Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19357ec62921f74…

MALICIOUS

PDF

87.1 KB Created: 2021-09-04 13:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd152fdb5f578ad573169193864cd749 SHA-1: 5999749aea00be5986997a14341a9ec2e21bd544 SHA-256: d19357ec62921f742c4d277ddc536b062f1205badcba9d4121c9a37488af2a0d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings confirm the link farm nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lighthouse-connection.at/myPix/file/lijokizikurotafevabumuwap.pdf In PDF document text
    • https://zlataraburmevuckovic.com/files/86020348361.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/63824611175.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/952e0b5008ac96384e01f62e610789a4/wedesol.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/jutobivab.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/66807010757.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/lizusafoxop.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/96946502056.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/2210540657.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/78771055708.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/71915930712.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2a341b266092f539b73996c407467693/4905845191.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/e9753ef62bc3ce62da000e637eb7d608/felegolujawij.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c99d4d71189---lakumatudosebe.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/17293160361.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90167b0d0d---48031911236.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/tifoluk.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb7912e8b---75503993675.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/zutotu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607be488d46fb---56529360594.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/87644448206.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/kewiwonidasezegex.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827b950943d---muruwasuliveturopesori.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/foxufigopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mobile+payment+system+pdfPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/8345154068.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_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 19208 bytes
SHA-256: 8d636c465e2c7962088c8a35d38e85fec111b3d8d1e3d60973bbdd7c67092420
font_01_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C8 10804 bytes
SHA-256: 4a6a21858d1b67a7244ab62eeb6d62e033c1022575437564e3f4e8dd6d025490