Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ece89eb6179b71…

MALICIOUS

PDF

89.3 KB Created: 2021-07-31 10:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 9e50373260160010ea47766e318715b4 SHA-1: ddd23f4c43cf3e13404acd703107aeb54dc5a2f1 SHA-256: 98ece89eb6179b71f81bd2fdf083c1dc738bcda067933a9b6162dc090a1cd198
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of multiple suspicious links indicates a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/8cc53a8aa578404f82a2d5d62b781842/kuvoneledujelojikinij.pdf In PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/94829813063.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f7141d27---31500875322.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c89607f0903e40f153dcb3f8b45c9eee/35769400822.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/wexadenasejavatixeduwidix.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/29063407732.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/vuwuvusiwuj.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/51655482201.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/jbe12bk6f6vsujmvoeglis3v83/vosifosonupesomu.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/megetikanuxisu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dfc344175f28c534ef686cdb6d5a4808/55867238035.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b0b5608b0d5099901643b7e5f3866064/sizilunepilapax.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d590195d8f---29220463215.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/079fcc5508e95bc398d7b9b65e342e8c/92230426475.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/30645429790.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100fd70ca6bb---rezebubufunix.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/retutotevisevovemej.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/88719773941.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/mrvs8djamc7dbajk4gco7h1hv7/lujuwigi.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/rodawokafazokorobof.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160757cc876817---44696312454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=harlem+shake+poop+grossman+videoPDF 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_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 22600 bytes
SHA-256: e63131ac8e86fd50e75319ed61059a03730feae96cd9bbb8b85274a6c93467bd
font_01_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 10892 bytes
SHA-256: d81f849f5aed26afdec92309daadaefe216039e31ff66726666fe70f33c55e32
font_02_sfnt_off00013d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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