Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9443bf96aa23f5…

MALICIOUS

PDF

95.3 KB Created: 2021-07-21 22:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 98b45e641ad851218ad09e802c9708cc SHA-1: fac21db801d7188e958063fa9770d874eaa70883 SHA-256: bc9443bf96aa23f525b1faf581d4801a96a3892af61f8306d638b136bf1963f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using disposable hosting for these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99cf7ba27---nigosituzixegol.pdf In PDF document text
    • http://lucann.com/Upload/file/78879358378.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a8036c92b---gotiwofafisosugozutapesa.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/65707b7818d5d442221a4ee5aa104bb1/1958703431.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/9cecf1b831283c97eecb36b426b199b8/97085340073.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/76354590079.pdfIn PDF document text
    • http://sushi-belovo.ru/files/28328555009.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/jirejevobo.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/nufoko.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdebb1446d---rakomuba.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e0819e2e75b---89529164765.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/loduzofugaruwagef.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626689823.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/57345998897.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/a46c6114d3389432fbf2ef4f97be918b/83966620859.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/4450a16eeecce9370c7788cdf2c74837/35362647274.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b47675cfadeadd38664775656c10783d/garaperevozoxejegekokeweg.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d566688b---76098309907.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/63208633562.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/94918687795.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f67c9e28d23b40883c8c36a3c7d97057/68017793798.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eb0f9fabe---59242566187.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083d7cb8f7be---geposozisudumenitizokakus.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2q7fhds0hj7anme09ehe7g0inr/vubevam.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/deriwunebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=flash+player+extension+for+chrome+androidPDF 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_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 16980 bytes
SHA-256: fb00be714281ccea5ffc9f56dad5a26e01de168438f51524a222ced7c71bdb84
font_01_sfnt_off00013ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD7 11080 bytes
SHA-256: 6bd8d67d82eca6480cfd97fd6a3ea9c089a7f6b2cc7555c17952d0eb9cfd9ea3
font_02_sfnt_off00015481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1