Malicious PDF — malware analysis report

Static analysis result for SHA-256 b844b99cf5a64616…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 05:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aa27b0ba9a766d8004549195954d3119 SHA-1: 5bde9ae67d28f7b2a1f944f59dba444fdb6c0517 SHA-256: b844b99cf5a64616d148e182832adbe4a9316c406a2902b0d1fe63e193f345da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads, likely to host further malicious content or redirect users to phishing sites. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d96e27f98---44721485246.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fef0fd1447---95705405578.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/tamozadesakonatudosaw.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/21314282223.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af87c2e4b28---jubaxuko.pdfIn PDF document text
    • http://ailizia.com/userfiles/jupugujawugo.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/74926571987.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794f44a43cb---48588463935.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/kilatopajejasigu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608351a0ba9b2---88310605941.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05e75704d---32798795257.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/rujofow.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1a0a356123bec3e34212142cb855882f/12264122454.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb13d8f49---nalepodetalutasilati.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6fc9f4864698a65c2fbddcdc5b8976ea/roduwilurituru.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/100150143322.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/nesobibagaxutonobanel.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/85ce92ae8b34fc602418b3d5c1eb44cd/vusezogogepuwaxifoxo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161110f57ae2bc---72949209935.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b477f652bb6---37667149709.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085772fc91df---95988548449.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/757c7a9386d55868802a708cc3613510/vixuzozibakojefezugu.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/zajokanolapise.pdfIn PDF document text
    • http://africareview.in/userfiles/file/xesajotavajusidozajijunu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e817e77c022789ad0383cd96bd486f65/46711513944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tnt+how+the+grinch+stole+christmas+special+editionPDF 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_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 17364 bytes
SHA-256: 9461dd5d4c5812a0847606ba7c795d3c8cab2df23066e0b1e05fcf0368733f80
font_02_sfnt_off00012776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 11008 bytes
SHA-256: bdfa81e5192ec8a8c38a38a72a392f9f7aada8e896b9681c04d5b1f4fb71f076

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