Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c6f4a8e84eef53…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 05:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57d730107f10d6444689bbb734a091a4 SHA-1: 4dcc2d79162ed052d67aaaef5bc625b7a7ae38ad SHA-256: e7c6f4a8e84eef53aa74c44169112653fcf90ad9669eda1b1c876d858e3d4187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=gaseous+state+problems+solutions+pdf PDF link annotation
    • https://feldmann-spedition.de/pics/userfiles/file/faregudunekefap.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16093adfa93581---juzexenisujit.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16111bd07d16b0---24081967949.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/febelemulukefiwotiri.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/vipudadaweg.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/5f784c507e01256d539b334e5c8ac6bf/juxoxomoz.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/66003234064.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/mujivadivakege.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/zadifizaraz.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/fagagijizapofirodi.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/rarukevasajidaz.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/50327c76baf14008fb4dc4fbfa0cbbf6/10104606278.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607346e61d03c---77403139095.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/41368226009.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210611192710.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m6vqlvc21f49ncvociha9fqte1/23175983264.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/gofolivin.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/50491798017.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/pubowavisipivatujanu.pdfIn PDF document text
    • http://12shio5.com/contents/files/38396704859.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/7f64c04e408ed141dc6bf30d167475bb/34137180850.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/pavotizabopoza.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/74584944106.pdfIn PDF document text
    • http://cartolmania.it/file/danozisezafojipivuvekif.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/xegowafebebupumasuv.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_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 10940 bytes
SHA-256: b0fa77403c7c8c3ce7d865f31bc12ba332df97f8c82b52e11ac143d2ef3ba353
font_02_sfnt_off000115a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A3 17776 bytes
SHA-256: c6000999097ebaa59ceb67d6a992dfe6ebc976ef562ccb21fad9074f94d64929

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