Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fae08fc830ddda1…

MALICIOUS

PDF

87.8 KB Created: 2021-09-14 01:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 195346c31ba371e4338a2bf27aea27db SHA-1: 878f54ce68a52ccee78d92d7e9595c86b77f308d SHA-256: 0fae08fc830ddda1ec25015ef1c0ac442ea8ab4bfabe34d36e8ddd2f0b353362
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://civicwomen.com/ckfiles/files/30224638961.pdf In PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/61873313675.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/fejijujonogomake.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-1/20210901165348396920.pdfIn PDF document text
    • http://rinsacars.com/files/others/zavemegumajape.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16139717b34eb0---6199724881.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/96904104172.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/99182310359.pdfIn PDF document text
    • http://njchemland.com/upload/files/fabowofudibute.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/nusojovewukupejor.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/rosenukimidexegodijexuzuz.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/sexukirizow.pdfIn PDF document text
    • http://linker-apps.com/files/44465502454.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/manoburotulovav.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091011100634.pdfIn PDF document text
    • https://msiutilities.net/documents/sobinavimusaloluziwibir.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161324567bb58a---kokaw.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/dosetamimezamefezowip.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/povubuwimenuki.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/kelawalojewuwaxewaledu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9112df1b---58951443526.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ae022870---wixafewovidarulevebot.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5e16f83e---86763484087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=thematic+analysis+inductive+approachPDF 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_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 18244 bytes
SHA-256: fc751b38cfc55cdd23227b136f7494dee6d67901c0c8a1ab310a9f52a3d8fef2
font_02_sfnt_off0001380d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380D 11024 bytes
SHA-256: bda68645bdd92bc953798dfc4f440d2782528bc694ad3d45d4f43c7ced97de5a

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