Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3110ba57a2b1315…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 08:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d335434e718c4c0ce31b56a20f098094 SHA-1: a8bfe5f90036903dfb4de196c578b6a5c0b25e95 SHA-256: d3110ba57a2b13157fee8561b7c209c1ea3569725acf4e9c19aec14dc015e149
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614262d98354f---61824515229.pdf In PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/55249885739.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/33115347225.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/rumaribekum.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/56326522613.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/ruviguduwo.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/vkiniknmqor6uf92mujrdqfg92/puzitugeramuwerox.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/4053095196.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c64d486e8c8aa953604e90b559751a3f/25942749958.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/toxupiw.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75136117386.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/78402914280.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/suvusawitovofuvoniruze.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090923521273499.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/tajizolebamosi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d42f88cfb---27752394798.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16132563618fbe---rakijevepu.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/dibobige.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/romovotugit.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/sigibikodapuvojewilepez.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/91631097184.pdfIn PDF document text
    • http://asvpp.fr/pdf/wubizanog.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/39711697752.pdfIn PDF document text
    • http://elsped.hu/files/file/vatutajetilabixe.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/jikapogawajowediriwi.pdfIn PDF document text
    • http://thepducphat.com/upload/files/xivejetiwibojevevene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=keyword+extraction+toolPDF 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_off0000ccb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB9 10488 bytes
SHA-256: 6763480536da87697482fa96a611c4bbfd4a7504145efd2dda7cb7b9e09bf752
font_01_sfnt_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 17604 bytes
SHA-256: 2b3fd68fd3fb4cfba929dc3998afb7a466daab158faf07d36f4ec9e37b6a08cc
font_02_sfnt_off00011226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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