Malicious PDF — malware analysis report

Static analysis result for SHA-256 988d47af72346b82…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 09:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55c53cd11631f8427a1dc4c4d790e52b SHA-1: 59b0c7536cb66344ee26e2bb15eec6d87952bfd2 SHA-256: 988d47af72346b82d5e72bb6c4e868379073ace87e56dcc588bc21a3af42966d
184 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute the malicious file. The presence of a raw IP address in one of the URIs further indicates suspicious activity. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d07ece1788---jujomefizexadixekoxeded.pdf In PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0713/6f263cb9da31a7c73e925138d01f8c08.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/45309723988.pdfIn PDF document text
    • http://72.47.203.72/admin/common/ckfinder/userfiles/File/10618435613.pdfPDF link annotation
    • http://gsemilia.it/userfiles/files/sekuzizowiru.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/89837403594.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6a9a6c24---givojejapavejij.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/tuvazuwunosulovizebaxewex.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b74b7ad4---sufevotafido.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/gaxurewanovimogo.pdfIn PDF document text
    • http://splogservice.ru/content/file/45581343130.pdfIn PDF document text
    • http://ore-processing.ru/d/files/pategajat.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16129402d31297---24707971683.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/r6vg0s3l9p0ev2034gnjjahu1d/takajivixuranulibimijaf.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/21966784849.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/72710051084.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/vumugimafuvamibenege.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76ff44f871---28977037058.pdfIn PDF document text
    • http://grimastone.ru/files/funaxanujepolizen.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d1b462d0044baf3cd13888259992ff16/zovig.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160945995ab40f---wijej.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/zodulu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/fjhd82c2vj6o3lc4f1o7rmtk77/xenotibizelasubisedezev.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/78360061369.pdfIn PDF document text
    • http://lecostationery.com/files/file/fononidewu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/05c03656e1862bfa7419ed2fc57638e2/kamexuxumulitadovugutajup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ms+word+converter+to+pdf+free+software+downloadPDF 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_off0000d1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 17748 bytes
SHA-256: 54810361db63510a20b0262279a2107c5df34a9dc0223b0fffe7b7013e6b9f44
font_02_sfnt_off0001187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 10664 bytes
SHA-256: 418f3bd1c1100c5b49aab2cd6ef314beb259fbb54587d2243c9a7fe3ae4fa50c

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