Malicious PDF — malware analysis report

Static analysis result for SHA-256 f853946b8d5b8759…

MALICIOUS

PDF

73.2 KB Created: 2021-09-21 22:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8830e4aa4a4d5ecd4186f3da537db245 SHA-1: 96a9ad38f7e17d729ba3aa766665f89c4c2eca46 SHA-256: f853946b8d5b8759c289c10b9c1194b7e3b005674e5ed4472aa5e68232d01101
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, and the presence of external URIs further supports this. The file's purpose is to lure users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://drafthe.ru/uplcv?utm_term=star+wars+live+wallpaper+pc+download PDF link annotation
    • http://bertoniamministrazione.it/bertoni/public/file/wifanekuno.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/vafowilon.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/5524956491.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/85477967922.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/pajiv.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/kiziraro.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/bepijetupidipasenukogo.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///95528512439.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/2750e73e8b4455509b37afbe18c269d9/28528597446.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/tovep.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/54413040120.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/suxajixawidijuvoxo.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/majemixibawipele.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210903_C48DE3DF593EF381.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c45be4294---pogene.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2c7cd1b6---buzenum.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130412d40bcd---xetijoxupo.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/49237225970.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210913082440.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/940d5552d4d1a912e6003a86188ca385/lebagurivif.pdfIn PDF document text
    • http://ebus.cn/up_file/file/jukatiseweroja.pdfIn PDF document text
    • http://lj-group.cn/upload/files/teven.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/wegevodizokazexetuwidajof.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/98992987762.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/34480513683.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/24235003452.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/9b6e89aa691bf5e4299f09450f84ded3/98805160932.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_off0000ba44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA44 10732 bytes
SHA-256: bfca3ad65eccabb63f1afea953c3ad8ccaa7032b6f44314bdd4067503eba2b68
font_01_sfnt_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 16460 bytes
SHA-256: e1764e3bd4aece4a1c2febcbf8e2f65ee244e78fcdf49899648386b66c7120a6
font_02_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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