Malicious PDF — malware analysis report

Static analysis result for SHA-256 4501cba731acc5b8…

MALICIOUS

PDF

101.6 KB Created: 2021-09-01 18:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89976852394ed5a591c48e612f735633 SHA-1: 80e15562b933af8ad647ba6089bafea6afe8da31 SHA-256: 4501cba731acc5b863b0b8ea3b97ffa94bd5dd4e8d7b443360cd020f963d0480
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple websites, many of which appear to be hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links, including those with UTM parameters, suggests an attempt to lure users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://vietsaovang.com/uploads/userfiles/file/29213122862.pdf In PDF document text
    • http://pappteam.hu/userfiles/file/7498365236.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a129ce925a4---lumenuv.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abd224da6a2---63485243453.pdfIn PDF document text
    • http://ridendo.cz/files/file/65361726306.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/88589338112.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709e753ba19---47493757381.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b4d550a6e---52889563821.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/hsq3l2445oleddp28ukj9ddoi6/lerofum.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/nomujerezitim.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/1e4d3c791382c57b5f2d00d56f6158cd/81795773272.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/34806572569.pdfIn PDF document text
    • http://focostrade.com/files/20210620100405.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a35f55e9d---karoronomudilofuje.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/42444790890.pdfIn PDF document text
    • http://cga82.com/admin/File/2680433311.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/42130136610.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/66954174615.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/77262073045.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/fudumekas.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/57329474784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=easy+majors+that+pay+wellPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001263b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1263B 17668 bytes
SHA-256: eed71b0bc98795d2e57c74c0f087d59ca5d06c0bb10e6a921bbbe7253c3a5d05
font_00_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 10636 bytes
SHA-256: 7d0bc224f3595cda5347fffeef420099e7e89b430d6875ce3d4d7d6ad6cb9626
font_02_sfnt_off0001411d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001592f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592F 18336 bytes
SHA-256: 3f279f30977b39de6bef01a3662796e2179edac3869070d0d32c382b297abc8b

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