Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c379b7902652f9…

MALICIOUS

PDF

74.9 KB Created: 2021-09-09 08:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fd16d06c74b6f64a360879b2a8a26f6d SHA-1: 12934f132f55a89b9e5b95e3c6c71e502924282b SHA-256: 52c379b7902652f9bec8f5b54fc0e4864313b56944b615b48c71f29c49fb1873
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves a malicious purpose. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://benevolo.it/userfiles/files/tarawufozitixofami.pdf In PDF document text
    • http://phdpecs.hu/userfiles/files/fusamilibuwapuzazotaf.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1h342kj5l4nv58skmo31bfh0s2/41094564566.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210902040326899.pdfIn PDF document text
    • http://licausi.it/userfiles/files/nibozogogonexazaxadavibut.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/72a166620e82a679f3d481e4e02ff96d/wipiruvuzevego.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/runurejupo.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16305538041727160916.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/82635490831.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/12147908814.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/nebeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613141ad5f27d---xidupawoseguropuj.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/kirebapul.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/25555493628.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/nokekubadadugeno.pdfIn PDF document text
    • http://punaide.com/userfiles/files/91844354347.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc45ccc80f---92019398577.pdfIn PDF document text
    • http://dgjst.com/upfile/file/solavarawoxibegiv.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/26186154984.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/090113032461.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161378caf69718---xezevubikogedokuwuligigu.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/55476203838.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/mobuxotusojemupin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=msa+geometry+book+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC581 10936 bytes
SHA-256: dc11327c1271e7d679ae1a569162b9c97014187aee9e76a9a642a6573f3d7b00
font_01_sfnt_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 15836 bytes
SHA-256: b48f474849d2afc0c5523cc34919896cfa24333ae2cdb3322ae0ea34cca1071f

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