Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b746b8860a0da1…

MALICIOUS

PDF

89.0 KB Created: 2021-07-16 01:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a2a28cb146905429de417b428a55c13 SHA-1: a14075ad1213821de47744cef755b9bf3b24da20 SHA-256: 83b746b8860a0da11ddaa9fe785977aafa1bd63966d2316e3b18115ec280b37e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ivaco.it/file/jivaxod.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d73d62c4b---vejavaponoleweso.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/tumetufapuwipuwevi.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/094aade4c4b91ef9db5854a616a6f128/87446940045.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b815cadf82b---41860989793.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/gigawuwudiro.pdfIn PDF document text
    • https://yuss.it/file/wudotimuzujifuriwekedas.pdfIn PDF document text
    • https://susta.vn/userfiles/file/bimazenun.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/790d04276df97f0c688c909a6f4d174e/zejima.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e3b124e5e---54163739223.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a4bbf9e9---dafolure.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81664a590---23365402315.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/lidakojevedezawixuwijavuf.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210624210347_157911467.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b992cac1c54b08fc6f14c66caf0cac71/nopufe.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/21839094655.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/rarijexobalarunikakorawi.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/jimosonorewoz.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a84b61faa---dubimozojipulubise.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/9a9edfd4d37f2e0c8f63b3ab46cc6e75/xapovoboz.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ekk9tij4lpc69q34ma221jnt38/84660707589.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/tadinavetus.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78ff73d0e4---worikeropagirenufefitato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mac+and+cheese+recipe+with+smoked+goudaPDF 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_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 11188 bytes
SHA-256: 8a3ad87d6bf1271e56f111dd38c5979de7b6b8717d47966218731dacd3528133
font_01_sfnt_off000112da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 16736 bytes
SHA-256: 980626bcdd1feab1d319f59b18018b1c23753b9b5e8d96e879f37b39eb56d9cf
font_02_sfnt_off00013e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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