Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fead4cc33783f25…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 16:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b65bebec38810d1d8452cde23cfa46d SHA-1: eb93a78ee78de3b2aca14e22fb82f2cfe230ad5e SHA-256: 9fead4cc33783f259e5f11ae1426d363bc9a9460c363da406e9e6e5e43cff237
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://armagedonspedycja.pl/files/file/genomolupa.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f9832e0fc9d6bb3f2d9fe52a69f799c6/94069873127.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/bd0cb16bdc28e3746d40391941f92cdf/xasedalomavubedik.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/fetawejuvetegajawajejava.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1621742741088.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/vupifudesekifusebesapiges.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/68d28f4e05fcbef8575a5a7d79bf75f2/vamewulogajorilesididu.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/getosuvurirugawu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/79338274564.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5ba05d26---27717781617.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/61605814203.pdfIn PDF document text
    • http://ty-int.com/files/files/28640841342.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf576d89493---gipurodaxawiwemi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607206200fc57---62419479290.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2dce4e10---pazusozusetemotu.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/84233859080.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/jidimurekaxofovojabet.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/29498757027.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a86e244757b---48911379757.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/90444145491.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b8f21a676c5158295c5692612db6407e/11536849794.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071194ceeef0---38371155861.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/741a49a807efee87ac4f302b4e049c55/towugarulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fisica+ciencia+y+tecnologia+pdfPDF 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_off0000c691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 19040 bytes
SHA-256: ca1372bfb1ab1edfa969dc7df71a0c0cee3e54d1943c3f057b5009254093781c
font_02_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 10784 bytes
SHA-256: 23bdab731e50dd201e4bd138957d7e6386e8ee3169c17a32e2155db71c311e7f

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