Malicious PDF — malware analysis report

Static analysis result for SHA-256 31415d3544119423…

MALICIOUS

PDF

84.3 KB Created: 2021-07-23 13:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d8db513c20956717472bcaebd565564d SHA-1: 35900429a8cc06608b534c32ea9aab8461fe486e SHA-256: 31415d35441194233cb1bb7264ac0ee84a3d79891c2f8b97471c04a1bdaad07c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b581881a756---buduvofetetewofikubon.pdf In PDF document text
    • https://luyenthitoeic.info/userfiles/file/deveroru.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd01264f5d---88009865277.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/dosivurufatitutaju.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e5a163956---javazuwipevuwuke.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/aa91fc29f1c046618832d36150d393e5/52254201887.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/nobesemase.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7844b1a9---32293317543.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/bc822046a7a7dccd3912fde79551ab51/sigawixukazezak.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/5952498425.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/lezumowifov.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/eglffn43o06s17qbo2gvt7uok7/30685425922.pdfIn PDF document text
    • https://agermag.ro/mm/file/92076385477.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/jenajazejunuzuxod.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7e342ff4c---faxifufitotimuzasabowosu.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/3osndn0k87uv2nn5oq21nn4c43/34201404371.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/855a8ee8f9c5c9dcdde9f11ae42b3a11/15007573006.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/65554387801.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ab6be24f0f9---zulisopuvitibejo.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/xegenimakeniguputari.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/bizewejajuratunag.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210619_7A8FC78FE61F8D6A.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1a2802e9992864fedc67ccd7b38f5e2a/lutubafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=54+divided+by+18PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 16824 bytes
SHA-256: 5c82cfb9ed5a0e2497d6dda71c0bb1ff688adaf9b105556a18ec57ad95c0d932
font_01_sfnt_off000114a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 10140 bytes
SHA-256: d78dae1f8e1a76ffc947121795d6a6a0d9f5b4469e3f1881c11d359f4d36b8bf
font_02_sfnt_off00012b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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