Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f83bc201648b9d4…

MALICIOUS

PDF

77.2 KB Created: 2021-08-29 16:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ce397a0f587f63aa55ac238dcd7d66fa SHA-1: a7eb2fa0d83c002d536d5f26e63f5c459f6a1ad1 SHA-256: 2f83bc201648b9d4a4b102e097237297dfe50900fa19df120f650e2f54d082e5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hr-serdahel.hu/images/file/dozalisajusaweziju.pdf In PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/kikimuzopegubarijizana.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-24/20210824080950554242.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a4844b63---fowufezividuterolizaki.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfa80951a7---joleb.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/lezofevovepixal.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210619185508_670510576.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f02606c2dd1---49588569139.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/fozekemixamukeda.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/d77ee9083a78ad4f265231467bb64f86/gabovajoziwixobuwagen.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/388f150765f12686602ba463c43b813b/1863759088.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/zesegesojesuxa.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f477eda05b---4544864400.pdfIn PDF document text
    • http://dejede.com/userfiles/file/xifasogozonit.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/kesanunifetuvamevelodi.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/bikubulibi.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/bapalakoji.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/malabezorenofarulesoli.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0584d0e39d217b3e387e725949dd671e/52982804491.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/22536089968.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3c3cc9d0f5d56a26ec4b78c9396ed856/nemezogudukamarefizo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/jdso1k35uo0puuved9ad891gq1/88331830984.pdfIn PDF document text
    • https://promise-land.com/upload/file/rewoxalozimapapuwefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=parallel+lines+cut+by+a+transversal+digital+puzzle+answer+keyPDF 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_off0000c5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 17892 bytes
SHA-256: 184d94f002a323c4776865cff3e1981fa4f15a75d0cbc6e9f6ef0949a4f7e347
font_02_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 11228 bytes
SHA-256: a8f4479e2831642e6faa1c178184af750509f6d6d6e6a17876e038f40fb9ef87

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