Malicious PDF — malware analysis report

Static analysis result for SHA-256 492468e02cd85804…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 14:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 659c3d98fda0d061add7a4dc1fde3e17 SHA-1: ba35da003213d5dccdb897139ae04c6e76ff0a90 SHA-256: 492468e02cd858040a15269ea25b1dba1e581e98a488b9a16fd31bdfe43ff71f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users into downloading further malicious content. No scripts were extracted, but the link farm itself is a strong indicator of a phishing or malware distribution attempt.

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 http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4cade2sk3ivov4od9frdnh7j00/somazusax.pdf In PDF document text
    • https://aronabritcan.com/userfiles/file/54688910085.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/fuluwix.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/14117573940.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/pajigulo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5776e58add08c221eb3c715cee2d2190/faxuwuboxegodowevijeponu.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/49361986343.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/womiduvof.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/39159603852.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae968520db---63728758121.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210903223144.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/rixipunajaxa.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/21159396451.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/91832536780.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/66161632552.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/suxeni.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/lixajasaduduxetikugiwudi.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/wokeligusivetunefupi.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/kunuziru.pdfIn PDF document text
    • https://fultoys.com/userfiles/12127385699.pdfIn PDF document text
    • http://sushi-belovo.ru/files/bolilojekaji.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/gufenogozagawowaj.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/14988966325.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zititogekebisigolelixax.pdfIn PDF document text
    • http://knipia.com/userfiles/file/mupexid.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/66402275234.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/xirijagoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=minecraft+nether+build+ideasPDF 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_off0000d390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 10684 bytes
SHA-256: 407d0b166a5ea30938007817941028a14bb7d701d4be8ae603b1cee4e0d24ab8
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 17192 bytes
SHA-256: cb6d27fb2046c821210d5e8de0019d3693348b450f76aeee09cf4e0234d308c2