Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe8aa36e4e8fc21…

MALICIOUS

PDF

101.7 KB Created: 2021-08-03 12:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 014b166a2a9bc907ced5198f7891a122 SHA-1: c7e564cb2ac6e4b04cad64ac2855d65676dcdec2 SHA-256: fbe8aa36e4e8fc216a1e03b8f0d51290fbb16a54e238d354f0a4d9d505069a53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to exploit users through deceptive redirection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8ccf44a39dd2915a5838eba6c17b5934/xosekidej.pdf In PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/95203253917.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/94111176049.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b2deed6c0b8ee839870538924aa93442/jokorugexaxidufanur.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/foveni.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/monaritod.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/renojilidakukesugus.pdfIn PDF document text
    • http://teraval.cz/res/file/4505605792.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/50549796849.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/tejuji.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/jodetazixuxuferuxam.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609421df4e4e8---jilijorefisoxog.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/33675847990.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a4f643eb7---30697679687.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/simonopedagedumi.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ggnnhubnbvcnkuak0manva0jp9/2014450796.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/bidibagejevotimazirese.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/dadagasaparolojini.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c443ca9bdce---49352540674.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/kufexapubulu.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/fejupaliwukirajimopeniwum.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/11183597707.pdfIn PDF document text
    • http://qzgj.cn/upload/file/jozinomitedufove.pdfIn PDF document text
    • http://splogservice.ru/content/file/punopenetawolaferidugeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=descargar+musica+de+laberinto+gratis+para+celularPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015f85.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15F85 22492 bytes
SHA-256: 7183069cae9716256a617f6e06c1676815831d9d711b65ce27097befacad8646
font_00_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 19476 bytes
SHA-256: e948ffea2daba9de841b6d3e770f0043fbf45c58598adc03aec6d1f5278ee709
font_02_sfnt_off00014616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14616 11096 bytes
SHA-256: 43defc1fd57478c46cd829779d806ecedcdd66df1f3cedd4cd4cc37d18f9dc65

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