Malicious PDF — malware analysis report

Static analysis result for SHA-256 70316cbf0e219e03…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 13:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ce095a66b5bd00e7c720b4897485673 SHA-1: fa519bfd8aa7ad044baa06ad974d8244a0d1a016 SHA-256: 70316cbf0e219e03c0ce3587aae527eb56a778e078ee46104a8ee61f6875cda6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://queure.ru/uplcv?utm_term=food+webs+and+energy+pyramids+worksheet+answers PDF link annotation
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7112ebd0c---wegatilonikifeja.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/gerox.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021081712064820.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90ceade0e---nezumupiritotosase.pdfIn PDF document text
    • http://sb-78.ru/files/file/59792464006.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/wuzedolidavu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/oudkr4udgkad8ir1fg7mu7ft3i/14131549782.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/zalinuzonefufidajolake.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/78364306037.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f2873003740b97687465bfdcb21f9bf0/16309382881.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/32514440329.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612de82154be1---69845223758.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b41e1e283---90097063427.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/92295650606.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/vudaverimulev.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/28752617137.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8085cbb38---31225612984.pdfIn PDF document text
    • http://metallpress.info/files/49989583524.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/23918230751.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae730f7517c---17212770555.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/13603495080.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/musajapivikuw.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

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_off0000bb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6F 16956 bytes
SHA-256: 361fd458cffae0e6e5aca1074198f318e02340f1989d59ac69fabd810e18a5e3
font_01_sfnt_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 11204 bytes
SHA-256: 03353a4aa98c0fa5805f5ee7b710332cd752c36d4891202c107bcb6c16232b8b
font_02_sfnt_off000100ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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