Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9e3214af0cc914…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 04:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0193deedea3dd5310a38a1651a696d54 SHA-1: de0deb1b7f45974962efcb1e9cafc1e5f34c0071 SHA-256: de9e3214af0cc91464f45859609b84b10d03fc1d0f4b8d15d8ab645eec04c066
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains identified as disposable hosting or compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to manipulate search engine results or lead users to potentially malicious sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://bakefruit.com/uploads/files/202109151236402092.pdf In PDF document text
    • http://meimagedance.tw/ufiles/files/bakerobadanakugisir.pdfIn PDF document text
    • http://4darchitecture.org/img/all/buzememet.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/wanekaxitibadatavafaz.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909202548360329.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/sosetupuzup.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/fuzapasimabapekavuruken.pdfIn PDF document text
    • http://trubaopt.ru/content/file/11857728662.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/ruzidilixezoxamixoveg.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/dabuvajuruponamuxi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cecdb48216---dibod.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/25459886942.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/ronebepinolad.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/xorupisakenolimoga.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6134f432b25d9a940435496132f21da2/33443454405.pdfIn PDF document text
    • http://snft.ro/media/file/74614150047.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/vedufurenagikaf.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/16413287863.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/13148968860.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/68359998374.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b6aac0e6---58198011757.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/12966094266.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210901165810.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/78553924131.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138129d4f5b4---15196486147.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/49958721799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=unturned+wire+craftingPDF 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_off0000cee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 19516 bytes
SHA-256: 6b9e7938ea9df4128f2199f2228b1f7cbf348a2a9b499129cb49c457146d47a4
font_01_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 10508 bytes
SHA-256: f2aeff457724e840269b28328ba3df59c86fda9615e71c484dd91956aa66e0c3
font_02_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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