Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2daa82ed908b5c5…

MALICIOUS

PDF

97.4 KB Created: 2021-07-05 15:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5cf5165b0bcb0ed33c0f8963031ee6e0 SHA-1: 947d3cef9c96c6485d3255a18b19ec4e24765eca SHA-256: a2daa82ed908b5c5d12fe6914ae93d0ca2c977e8e9ba3fa59930de808d29d574
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and numerous URLs suggest a malicious redirection or download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://youandisagenix.com/ckfinder/userfiles/files/lenapok.pdf In PDF document text
    • http://abwplazaview.com/uploads/files/xajagiz.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/feduximovotewagigug.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/fexizurukutatejesineletub.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/20518435804.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/68986822253.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/277f1e59ce09aedafa46655c4e2213a0/sufubajutepovemonaz.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/zudiruvare.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/wuxejopumibapexiroxur.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609983e9d893e---56906457460.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bjqr6gstodsqvvlqhf9knbk6pi/gefebezufevev.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/wobevabupobelepolopumafor.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/jotolubivitofedipijew.pdfIn PDF document text
    • https://tdfstore.it/file/69262038105.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c71e17c19a6---begogixara.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/89474129062.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pt8jbj920hl9i4l4nb0098a1kt/58198515344.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e7e6f1f79a76e24b83a1401ee9adfe57/refodekesukowosave.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901460baeb2---dujutizolexukomom.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210702161831_t328p2.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d33cacac7---barukoweperegewekoj.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/lagosotedusovurejuxej.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/petiganamijofusiwukup.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08c4d4e37b---viwobadibojer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=small+bird+with+blue+head+and+yellow+breastPDF 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_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 11028 bytes
SHA-256: cf6938a4db41e98162df047c60652b3f9fe34086b451e496ea1c2e0dd8e5570e
font_01_sfnt_off000132ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132ED 17412 bytes
SHA-256: c59dc28d96e878f6cc86ebbe2c07dd52fc34c05e2d16a1cd8641115cd0dddab4
font_02_sfnt_off00015fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1