Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aebe69aeb41a16…

MALICIOUS

PDF

138.7 KB Created: 2021-09-17 10:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 160d641ca850d29477c11294238c7026 SHA-1: f084745bc0435961cd315e1d91674eaed04f60b7 SHA-256: a3aebe69aeb41a1690679e9fbbd422bee4e13092ec8d90b5429e78ebfad8081d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9587

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://philabc.ru/uplcv?utm_term=telugu+mp4+movies+2018 PDF link annotation
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/da995dd26aba2d7c563d5cb936dfd17a/pojejabaweb.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/16784621207.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/68864238370.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/xubof.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/65819160456.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/fusutirozugokurolufoduvu.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/27529806921.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/19108175401.pdfIn PDF document text
    • http://dolonchem.com/upload/files/bixipogolesasi.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/jiduvo.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/jimuwobigawore.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a0ac6cc1aab00bc1c3cae66b2a68ce15/29603730903.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/sugikuvixadedere.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135537832411---20162360408.pdfIn PDF document text
    • https://isosklo.cz/uploads/silodev.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/reberubotolomono.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16139864129122---9329295583.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/sitevenalat.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907143320904085.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/venifipekupozanilofumo.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/nudapobelikiwun.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/62835844035.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bd2f478d685d2a0bea4dc8926cd49038/jifalupozedunawi.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/xogug.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AD5 25240 bytes
SHA-256: 40818cc2047cd5143aca4a8740c27738e1ea05db7d1fbc96ce1a5cbf336f561c
font_01_sfnt_off0001cae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAE5 16532 bytes
SHA-256: d191392cda5645b1e7eb92ac517f1ced0f285c26d706bcf78f40f6b66e1b6ba9
font_02_sfnt_off0001e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA2D 10840 bytes
SHA-256: 66e4a16c93f48db40224e01254ee32ad8ad0625b5031d6290b2ee19c64b616c5
font_04_sfnt_off0002134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2134A 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729

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