Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4feec87f6d8f82…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 00:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8094d031db9db22de3e81a75e8dbfd5 SHA-1: fa90e1c109b0cb7ebf4716a28b4626ebc60f70bf SHA-256: 4f4feec87f6d8f828637fe3369b3cdedc65828bc00a3d37280f1bbee0a1a53e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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=ble+14+day+challenge PDF link annotation
    • http://buyyoutubelikes.com/ci/userfiles/files/vurafonizo.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/37956531366.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/76357360343.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/90158268183.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/40005527520.pdfIn PDF document text
    • https://werbemittelag.chupload/file/8984344343.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b8c9fcd78671b8e1482d39156715f8cd/96116530117.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3e8b11a6b---15640463168.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/judebuzuwasizijas.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501211558598842.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16071183e0c3d7---62896208523.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0189d8acd---mafud.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/lijerotap.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/90ac7595c2dc3138c2fdefc45f043e82/60869912675.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210628082948.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/la1h8odjpng5s3njd6a4se0uh0/81278555021.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/34337273249.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071ada002561---vivemarolamut.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/rusoboparopa.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c47e39564f44d4654d940b061eeb269f/27951614678.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4365188cb8---62977762728.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/38562666740.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/77579288653.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 17012 bytes
SHA-256: 11b69d48811ff677bea44f520c25b8ae31cd7b781c0a47171f8f11652d9fcf16
font_01_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 10368 bytes
SHA-256: a6890323394da0b4db939c5b9ea5234a7b2bfde55f0b11dc138fbdb0848ee58d

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