Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f8a324177fa3fe…

MALICIOUS

PDF

90.5 KB Created: 2021-08-07 02:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efdb6cade2647e9fb6f027c03942745d SHA-1: e1d452edbde3063f33ee0b12ddb51ec6470bfbc0 SHA-256: f9f8a324177fa3fee127ef97c8dfc8f12d6dea0fe8da0117e1a4cc77e75dd6bf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://gs-hemeringen.de/ablage/userfiles/files/20801497264.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/43580d65ba9a445fd8db8c02795221f8/funoborurobovotofefesibo.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/4e93db080af91dd8b2dcc034ae8b2456/64431948122.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ns8pt4jh90t9srrpmmd59c6pd4/26804899672.pdfIn PDF document text
    • https://peterdegendt.be/file/xomawa.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/ca38e27c62144aa2a2624d12a2b39b8d/mifazemefejerevejo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d11ec13d---42265715701.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161065c9b068df---81156432590.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/58562173335.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1762a384---12185780168.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/69b85f2da61ed026c2769c47d9909d2f/51422945846.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49039a66be---54318792191.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/40512058435.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607770f5d9104---safutalatag.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087c48915cde---pilul.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/19713719098.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cfb6506fa---widapot.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/fukajatuj.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/megewabum.pdfIn PDF document text
    • http://esistore.be/userfiles/file/81483220822.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6c7d831a3ee6c76bff83b072c268ee86/vatavomekitodoloki.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/1779445560.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/71740846097.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/mefifogexabader.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/78837729034.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/pazowopak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=secrets+of+the+millionaire+mind+bangla+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_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 11284 bytes
SHA-256: d7f948a0648ab68a4ad18ac919aec775e756bc67a509588e6988cebf8472093d
font_01_sfnt_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 17096 bytes
SHA-256: ee883f99aac9dad93fae9b63acf2d17ef28412d19a37903f02d362897b9290fb
font_02_sfnt_off0001434f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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