Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec410b1b6db7850b…

MALICIOUS

PDF

85.9 KB Created: 2021-07-08 02:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df8caf87e5c5b108b23ca51f1e1568da SHA-1: 037e909af717be038e674e64c52c760bbfd23ba0 SHA-256: ec410b1b6db7850b6fddb6d8f55c31c52111f168ce63bf3c0a1b044347ab1a84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the primary goal is to redirect users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82a716949---46529366055.pdf In PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/nusefomarurete.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/wuzudatuxenodajuvov.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/zuzux.pdfIn PDF document text
    • http://lblussana.it/images/file/ludano.pdfIn PDF document text
    • http://chinalabware.ru/d/files/nowujofane.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wutifuwesazapavo.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/32251590099.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7dpa80ttbpv18go4j1qkkcg04v/remavozazejedaturepe.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/e2bt119q3721gt9hu1sbcfnhins6grfm/95561663984.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/hkg626omqfg578ic46sh1aml93/xawalexekowuvubigapawa.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf63dc1948---21321049732.pdfIn PDF document text
    • https://faprosid.com/file/luratezig.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/dc8624cf11e49eeebfeff49fc047a3a8/88700367158.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/7765457642.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/78059919456.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/3cfi2qf27b9sk0aolv2lj085lo/vifazulawexoritinuvofeme.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/61j703tlon2et8jcqf8s3u3g46/wekafewafu.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/dixunajeripaweku.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/57886331633.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/55576030070.pdfIn PDF document text
    • https://ive-cal.it/file/66905667676.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/toruwenetegizivajatagapax.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061215183191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=google+search+educationPDF 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_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 10788 bytes
SHA-256: 06a760a38d465a5cbf1065bd62da485cf09e96485166c863bd7bc083530d491b
font_01_sfnt_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 17180 bytes
SHA-256: f46859a9f753cccb369499fd28d99b0a46ecf696ae193f1031a830790b9e9d1d

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