Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5715bc186ccca6b…

MALICIOUS

PDF

80.2 KB Created: 2021-07-28 10:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b6baca55f87a77553b0de89ede1b4e17 SHA-1: 5ae2e0a0e268de0344e6744180972f1dbfce59eb SHA-256: b5715bc186ccca6b2e010a217f7b19114b499443d7cc2077afaac2dbca4bd482
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/2eb6af61187b8c2f66f99c4f95f3ead9/56172493214.pdf In PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/44737462438.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072d1a036600---5926380491.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/zikizuxexufevugixoduzi.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/xotogubenij.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c82ee099---23845061855.pdfIn PDF document text
    • https://inncredel.com/uploads/51633124961.pdfIn PDF document text
    • http://abpaluso.com/upload/file/xarefonoxixenajojaxalo.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/92380685736.pdfIn PDF document text
    • https://udruga-invalida.hr/files/60545889112.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/geparufeladoxabeguzex.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/wozoluzolebuw.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/61765752275.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/m7nob0ripq58utcrnultb6bckv/tawatu.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/senaritamaka.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/lodapotuzixipex.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/kexemunufazobimigiz.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1ebcf43d---93905733158.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/93022c19402d29466fd11c0d78cb267c/56572553276.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/15800353585.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077204ead9e6---93084492349.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16080454f943ed---80557096240.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/sasitir.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cce833dca---40826451768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=combined+gas+law+worksheet+answers+pdfPDF 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
font_00_sfnt_off0000c22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22C 15736 bytes
SHA-256: baf3a8e9d83ad3638d56f12b6de030f6f6df7b8a681149eadb1c83415d4ad6a9
font_01_sfnt_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 11292 bytes
SHA-256: b1f4a41b10580c6ac4ae52a29bbe445b7ed38b90ad656195de2ea2962e29a251
font_02_sfnt_off0001049f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 16084 bytes
SHA-256: c27fafdda185be2695e99106f22849c7304d1d4eff2202c3575f3979fbde09eb

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