Malicious PDF — malware analysis report

Static analysis result for SHA-256 343051974f730d5d…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 06:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9b25d2503a5c1c9c1c09859e7223f54c SHA-1: 15f4ee14f6bce84be9fe525017bbc8c5028002a3 SHA-256: 343051974f730d5da2b89512b5ad37db19a94f486a6cb86a4d15b996073bd24e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and compromised CMS upload links points towards a spearphishing attachment as the likely initial access vector.

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://schmitz.cz/res/file/87506052196.pdf In PDF document text
    • https://viboot.com/ckfinder/userfiles/files/28910949525.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acb57e8a715---62667680709.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/69930933561.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/gatalawaxuto.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/jifebir.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/74304392259.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c7b66124---6276407008.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/6944281038.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/24674406485.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607247ebea6fc---vijikefedutokedutavewos.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/woziperiguluno.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/rireraxokas.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/dejakekoxagakaxejog.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/75238825295.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2b8af77e---39716415583.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16070be6e53162---46814916843.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/1637656787.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/66255736878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=name+the+following+covalent+compounds+worksheet+answersPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kanolixasiv.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_off0000c72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 11388 bytes
SHA-256: 783182633f4a1c9f417a847aa6424e215dbf5bcc93f5bcd4443c5f1b4c7b3069
font_01_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 17152 bytes
SHA-256: d7f89e9ab86c4cfb6f39b60cdbc29aee3a7c68b846a0d2393fbabed17800f8bb
font_02_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1