Malicious PDF — malware analysis report

Static analysis result for SHA-256 052e6026e83fa288…

MALICIOUS

PDF

88.8 KB Created: 2021-07-27 16:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e31b4f5215ac9b6493322844c0f63dd SHA-1: f66722ef9e4fce82fc57d62bf367749b05d03a26 SHA-256: 052e6026e83fa288805240308b4baacfb0492e9efcbb1fb19b75dd01f6dcb0cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, indicating a link farm designed to redirect users. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggests malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further corroborate its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/bigodoza.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b91f26aa429---47050366548.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61b06fdbf---53390326162.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/24/file/20210524_212039_119.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/jabagubabusutafun.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607920f9cd975---ravoroponumiba.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9f4d22b2---60683690632.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/latorimasove.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/63635333147.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210705184247.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/fajejodevuvotolowezafitob.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f575d9986b191998bbf32920f9e70a69/72631493827.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/56172330702.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/29971704957.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/3i4on5v980bv9e9a7d5h1a6u71/76530231878.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160996007d529d---tomuzisufefevorefizin.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/95585736641.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/11067359714.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae22a378f18---terigusavolo.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/mozorinoj.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/df54ab36c124cbee3db808df79998d00/65985473074.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3edn4mo8encfr1hmvs7afmpq5g/13883400005.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/m8vhtg06p55jbigg647933h9l5/majefidade.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/v20hpbqokqvtorjjulsuotp0vd/dibuwiwo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/setuwunulaxuvojemoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=khloe+kardashian+engagement+ring+tristanPDF 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_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 18240 bytes
SHA-256: 541faa8253fd6bcadd259b431fa015384b64a03fb04174a49dcd52c0b777ac43
font_01_sfnt_off00012308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 10776 bytes
SHA-256: 667d6a3a455b56d3860537f61aca525fa1f3cdcd06ccdda5754f69f55a88491b
font_02_sfnt_off00013b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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