Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e10e9923d8d358a…

MALICIOUS

PDF

74.4 KB Created: 2021-07-27 05:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 055d2d4ddf76b469e8f038c731e51e4c SHA-1: 61a1582557b64d9a1f08ce01c852df0fba74d6e4 SHA-256: 1e10e9923d8d358a99691d4346b58655a394d9970cc17a5544550a7cbc56c757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5f3c027d---8598859501.pdf In PDF document text
    • https://andana.us/files/files/faganomewukarazi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/f4h82r2l7kr7msl8jt0hrsd5r8/fanowabo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6035d2cc6---lunubikubavowerewogepal.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/wabemesaviwonuguwefewudog.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/82797597640.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca639cb666---97146458479.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/fbb08c70c9e8ea9e301012e26da0030f/gipepugemedarakuv.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/zalebovizekesunepol.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/pidifepivorijeke.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/49736431843.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ba7e997f9e52b46efd3d8f4d653d64f3/kitaranatezugumi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ee13e28beb9953f2e5febf5441be1a48/buvizokawi.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/xuvedebisodeb.pdfIn PDF document text
    • http://alkanboya.com/files/file///levenofarejodunile.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/95458677439.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/9umgp8qe8bvj5pan1u59bpfnb9/zoxidasojagure.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a66a3105a---bozivesuvugazib.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/tumolaramipagovogevajo.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/rajumigiw.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a44a189ab39---51429916925.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/42834808474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=is+tcl+tv+made+in+indiaPDF 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_off0000c257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC257 10328 bytes
SHA-256: 560b8830cb06f18c40d63a43987cbbc69136714cd80339b09d15b25eb93a52fb
font_01_sfnt_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 16448 bytes
SHA-256: 7bd58c599d8eb785e1d0ebe3ff8406a956ec965bf087b0f26b8d45324a533823
font_02_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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