Malicious PDF — malware analysis report

Static analysis result for SHA-256 4325526ade9b60ef…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 20:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c85c34ca246c6ff951ef7cec272fa758 SHA-1: ba3c18ebc2991982da3d19cdee711e0c29a94c1e SHA-256: 4325526ade9b60ef4ee24ba13d2bc5096e44b1fb042d423d523357592fde43f2
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, including one hosted on a compromised WordPress site, suggesting an attempt to deliver a malicious payload. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://djk-winkel.de/images/uploads/file/pinenuzetigunixoxig.pdf In PDF document text
    • https://isleo.com/i_photos/file/41401462129.pdfIn PDF document text
    • https://diphong.com/uploads/91089936904.pdfIn PDF document text
    • https://greenways.at/userfiles/file/29588326851.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/xanowonim.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3c464c5cb50baf64795fbb7a62380fa8/giralukulexivup.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/sitibagejer.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/pibawuzevuzuzaxalakoluki.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/vupese.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/zaradadideponidolaz.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/fojitemuwanarikanog.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/li058uokjbgklsl3j2ui54k2e6/bezinafufu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e3bee08b535e7be24ff87e6605770c85/togewipufosogukonijegedof.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/zonivex.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/62632347379.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/zikizofiduxamurovudesivux.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc7bd9e9e---lurupakuwidekubuku.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/87440455194.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/93484449928.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/kuzojorurureturibivoji.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/silubikuvir.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/gizuzobibikakosu.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/3519103547.pdfIn PDF document text
    • http://dmkert.hu/files/file/mumotuxuvadinusofipen.pdfIn PDF document text
    • https://kuepancong.com/contents/files/88942786574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=top+drives+mod+apkPDF 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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 10428 bytes
SHA-256: 20bd203fc78e6fd9b1feb915a371acc6c8b742d88be8958b398c970775c99829
font_01_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 17228 bytes
SHA-256: b2a9af46f4f85ebaca7a3c16525228f5528475af4f2f4bc09e29bcabb1ea3b9f

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