Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe682136d43b38c6…

MALICIOUS

PDF

105.9 KB Created: 2021-08-04 09:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30238b0230a5dac195dde4028d201dce SHA-1: da13c6bc724b9a80cee59264b89b1874822788f7 SHA-256: fe682136d43b38c6371257f82db69d41accc251bd3bf4eed917a1184657231da
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on various domains, many of which appear to be disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://capitalsyndic.com/userfiles/file/banilakudagi.pdf In PDF document text
    • https://advik.net/userfiles/file/87446469736.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/mewedosagotuse.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/xafatizolagekafegafoxa.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/rowejigawabu.pdfIn PDF document text
    • http://simonide.org/userfiles/file/xumuzewajawikivobofu.pdfIn PDF document text
    • http://hncastlecable.com/d/files/6749916695.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/12951012388.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/158ddd6e32a82aa31860333a4074d09f/99094943933.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a92ab3d66c7026307ec68878331f29f5/zolevurilumelefepilevu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69ca67af34---83993088195.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/00e1b2.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210618_C69B913F7E6C92D2.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/gll54s4gth5pnh2etk64avqc2d/73716231124.pdfIn PDF document text
    • http://drtamerturan.com/file/wemukezelizolu.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/r7lffp3bu43oh9589tp86mtdfl/17261239053.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1159047ca28a4f0b4032752bb98badf2/zaderem.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092f8d064eb3---vafulexibivasonojalujezi.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/12737153225.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/045db6fc54f0d654bf1256abf7d3b971/60813038784.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/dimokatotusix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+species+is+rouleaux+formation+normalPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12375 18044 bytes
SHA-256: 19debdadb0dc1954c4cc48c07366da8daca6b38e461e7d9d8a3d71cd6a39cace
font_01_sfnt_off00015226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A3D 10940 bytes
SHA-256: eb52e10c3163a1362d26ee11214964686d4af6bb3e3053b07a0bc9ffe758453e
font_03_sfnt_off0001836e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1836E 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58

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