Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fc0e60d80b1a5e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 16:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 572b947ed97b44e08f0aa783c700a9f8 SHA-1: 0be5669abe635c459bd5a72b4d54cc2fda7de6a1 SHA-256: f2fc0e60d80b1a5e80a63544f8a842f97b1101eb88836ca996794732209a7b1c
96 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to various external websites, with several links pointing to compromised WordPress upload directories. The ML classifier strongly indicated maliciousness, and the presence of multiple links on potentially compromised or disposable hosting suggests an attempt to distribute malicious content or phish users. No scripts were extracted, but the document's structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.medicellbank.com/userfiles/files/81626083270.pdf In PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/79767050943.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/19352253868.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///wapawejef.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210925_190133.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zowuziwokapolunidinoxeda.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cf8ad283fbb9db23a52c08bfa72216c4/44378331628.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390681b0291---5806259572.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/zuxisugek.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/luguzib.pdfIn PDF document text
    • http://alltechsro.cz/files/70527653507.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/84233411473.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091003214797817.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16319428698275455ae3eaa2c291ee.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/lerurixi.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/66038e09cb822b194b0e90d9df9e5994/vuvojalodusoxizu.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///91875071678.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210905054737173280igvyk.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/faxoxegaxiguz.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/zejidakijavejufexoga.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/82172970980.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/bitaralobewizelut.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/valifezi.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/mumawetolixefobimibej.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/sifozugetotudon.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/74342412730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=transfer+contacts+from+one+android+to+anotherPDF 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_off0000b443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB443 14196 bytes
SHA-256: 663bf08e77904f6bfd24fb46e421033ece7a66469e3970016ecb40b05af31bd4
font_01_sfnt_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 10660 bytes
SHA-256: 00b23f6e1297f423fc8be7d6a459c90fd5f053dfe30c506db8dda2186cfa0d02
font_02_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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