Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2c275c6d8c61ed…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 16:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28f74bd67f59b1c622d2998afa582c8d SHA-1: d3067916eb139bdbb1ce365259a409d525ebcf31 SHA-256: 3b2c275c6d8c61ede458b84cf692ce78f60a1c477772c2762bf45549ccde0696
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.amedna.com/userfiles/files/bikurejidojenem.pdf In PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/21869818046.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/8104991958.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/jewatebufalumevodolopidob.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/latezatasitojovubikimaxe.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/38393f890adc9719109da753177d2824/26078243428.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609592e9f12c8---wepewikomufiwinivudowifo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8cbc6f42d---65338849571.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/bepisop.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/vuzozudiviseviboresod.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/24c8a9329775591e36a238b9afad1d1f/22293044711.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/40b2becc7f512549744211bd12938076/zudexe.pdfIn PDF document text
    • https://ntc-container.com/upload/files/44937371535.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/25264146380.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/fidaberanetugam.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zuwefododutitanijawag.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/18797789408.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/befugusevuba.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/tekorafaxeji.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/79703985046.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/85043485330.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/nuragupud.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/fomujobavenesujumuda.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609463df1e878---nudoborekejinatozoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=reference+letter+template+for+rental+propertyPDF 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_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 17656 bytes
SHA-256: dd049168181aa0460486174b8afa4559f1693f58aec2b77bbb4ee0be448c3262
font_01_sfnt_off00011ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 10540 bytes
SHA-256: 101a83ea85f82a34f15a596ba3c02a6558ca82dd5b692207f66f463db825836d
font_02_sfnt_off000132ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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