Malicious PDF — malware analysis report

Static analysis result for SHA-256 058079bcea72290e…

MALICIOUS

PDF

82.8 KB Created: 2021-06-27 14:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 92909594d7e6288501b921951e7039f1 SHA-1: 67fea49942a3c7a64c6e402b3333d9c2a044047e SHA-256: 058079bcea72290edfc3b3f207602ca3a30861506508a27688f98aec481e463b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links point towards an attempt to redirect users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/uplcv?utm_term=pennywise+thrift+shop PDF link annotation
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/34c88d1b9a4f7b4097b7cc6eae743d5a/timedage.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/vakasitoxif.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d63ee4614d---savajokisuvibaxewifol.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/77c12192c817030a29ede42a74e35508/39730108222.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748267a6c39---12747094911.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/mukon.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0551b59e8b066487361b8feae8933237/12783194136.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/tfkn7kqn5thjqfo93lm0f3p2qq/79443294649.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d329a33bd77c9a3164dcb892babae6d1/94228072814.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5b7b7634a---76327789349.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/32026561839.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/patufixifezekifuwitena.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/kojevaferenovatixu.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/dapoxitowafagatiret.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1b730ef76---sizinuxet.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c5bc7e5d7b9a320c23c6a7ad19020a73/tefavekituxazisadamovuge.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/joruxeb.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/67048056432.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0ujgv20esdvbc5ovueu1vqgldh/52490619642.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/26046354448.pdfIn PDF document text
    • 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_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 10448 bytes
SHA-256: d48c20180f5c1c7efebf9d614beb7b29124a5c1ffd24270ac5e996f65e667def
font_02_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 17676 bytes
SHA-256: d516308350ef959aa62b4e5ff480e4c89adb42c5b681ff425cd9dc1f7e9e1908

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