Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f09c47b5e4ebf1…

MALICIOUS

PDF

112.5 KB Created: 2021-06-26 22:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1b3ba3e2026a7060ecf0448ecb98d331 SHA-1: 2a26bb5c57b5a049dec34c2d7576ffc764149eff SHA-256: 84f09c47b5e4ebf10f6d90d0d9db99c9e018ef6639ab9c832f7056bcdc48f899
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://oilandgaswork.com/userfiles/file/pedubodopov.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a17a7f3a4c12dac09045f90487445cda/jijexafinute.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105181054.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077066428134---79768470058.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/771f3f9f7d927cd11d856971d5aff317/99153594985.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91f624f44---25903613153.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/71664805909.pdfIn PDF document text
    • http://e-hane.com/files/dogemol.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/xotajizekifomulatuvuj.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ndrmn32koq27a12a7gnc2pgdu0/kuvokeviw.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/89136189027.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097361ce19df---tipixexozuzufusoxup.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce02c613955---39178490200.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4a8528c2f7f34515af1b37a332faa207/rokeditavewujirewonalulos.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f066e19424c88b3923e4c8f7cd0b0c54/56579166418.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/60906281720.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/616a9dd19809e5ad68afa47207ea2422/41997280016.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35b5c03bd---94187302992.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210612_212004_9060.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/lv92orjog8ljv23ei9skhh4332/pujemisez.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37f1a22dd4---57068312359.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c1bbc44fa---90879882432.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2f3724aeb893c7bf9188f54ebbbfc6c/71216224695.pdfIn PDF document text
    • https://medtek.vn/storage/file/20083367872.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd08952d80---47304482066.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105021114247293.pdfIn PDF document text
    • https://people11people.gr/uploads/File/24175647280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=promag+33a+manualPDF 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_off00013869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001507a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507A 16856 bytes
SHA-256: ad7f8f5c91c102aa2def0b97f9dccea864e30c08ba86f6333349706e5b3943de
font_02_sfnt_off00016822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16822 20684 bytes
SHA-256: eb9d0be645657e323b69cf7aaf40f2cd6e391ae1a87c655efc77b8a434272df7
font_03_sfnt_off00019d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D38 10236 bytes
SHA-256: 99255d55658c4d8e1e5c935c098830d2096749e2384a5f5fbff09948688b6490

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