Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17cba193f241e02…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 21:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8d776f2b7165e0d8f7437ba09a276a63 SHA-1: dc949a742d5590c474e89c9d3ff9e196e1055136 SHA-256: c17cba193f241e0257e7afe741092debf75df75da71a532a9654cdec686c39cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like nature. It contains numerous URLs, many pointing to compromised CMS uploads and disposable hosting, forming a link farm. The presence of embedded URLs and the overall structure suggest an attempt to lure users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://felicityokolo.com/file/83356094573.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161318964a2ce3---numidukesojegobafi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3ffdbd407cbc5699df86586474746d71/zilugimoporaxaxapam.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/logejemurovugeze.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7cda2d8a2---96421688639.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/51570733884.pdfIn PDF document text
    • http://dgkno.cn/upload/duvusalikodudap.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482efa1fb9c---22288798219.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/wutegorejogowizexuze.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/76545944945.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/3135420415.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/15518303858.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lebeliregejafazolupu.pdfIn PDF document text
    • http://perksys.com/userfiles/file/87935983298.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/90618997021.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/guzuroxituxonepoxixa.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/dofutetaxoxupowirugo.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/nonivofejetadevevifiseg.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7bb07dd09---49512387933.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/23316522218.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/57121956433.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/sakeravojur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=youtubers+life+android+free+download+full+versionPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/kelumiwezazaravuz.pdfIn PDF document text
    • 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_off0000b17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17E 14884 bytes
SHA-256: 48c4aa8eba50b28f30acc59f50c833763b07c3f3a440b64b7503028afd966df0
font_01_sfnt_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 10724 bytes
SHA-256: 0ac3785632d79603852d7a2e60320a356e92fefb728deeb5c876e9767ddf8003
font_02_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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