Malicious PDF — malware analysis report

Static analysis result for SHA-256 facdc5afc1f42052…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 03:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ffba131aa263233a057fa8244d6101a SHA-1: 84cf0e2dd29b9d3cf9da60fc9cff4f2f370e0300 SHA-256: facdc5afc1f42052ff6d91c2e2b0fc81e532e7565b3184d853096612e99e92f3
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to PDFs hosted on domains flagged as potentially compromised or disposable. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious files. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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://havanic.com/cache/fck_files/file/47169727860.pdf In PDF document text
    • http://setadijital.com/img/userfiles/files/kinebodivorizolinexun.pdfIn PDF document text
    • https://jotelek.hu/files/file/perabibejisose.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///nepawirudizevunomajiw.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/zemekozovaxedigezotat.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/piposoxetevadazak.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/nubuzabubeku.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160853ea709924---45159144234.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/deredipezuzefex.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/86865494696.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/42555477384.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/vaduvebeturaz.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/bikepupuxugovosajeviz.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075784061e85---64513941836.pdfIn PDF document text
    • http://change4best.ru/upload/file/fasetimamezesopazi.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/74585057454.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/89283741831.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/todad.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ldb0ndmd387qm8v85006t24t84/sijamuwegoxalukajata.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881653cc552---39992084159.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8ef04c26c183aad874cca83a35650c0c/vuwor.pdfIn PDF document text
    • http://domplus.su/userfiles/files/zosugar.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4b48bd4d228bd571016b2ad196d38078/62211606752.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/83931438632.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/fukubokali.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/093385d63ba372cce714fc0825772efb/suduva.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/50713417955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=long+and+synthetic+division+pdfPDF 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_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 18092 bytes
SHA-256: 3e39e28a688f809c920c1e7edf8c6bb78a62398ec92aed491abd98a0a2bfb2e3
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10892 bytes
SHA-256: 1226827be4af73827fc8a839dc0bb67c6d261f12dd6e50a99989f7a4a9a0bdd1
font_02_sfnt_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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