Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e32af9a5ccffb6…

MALICIOUS

PDF

90.8 KB Created: 2021-07-31 15:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6137efa0d8d966b0ae929f3bbc8c2813 SHA-1: 4333d03358817cebbe729b9356a435d285a7bdf1 SHA-256: d0e32af9a5ccffb6c6f01bdfff0619f9d76ab1a1cd766e554c52a66e271f667b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal malformed streams and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://huntic.ru/uplcv?utm_term=of+plymouth+plantation+reading+guide+answers PDF link annotation
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4fc6a98b17c1675ca9f37e912d09f31a/10334551261.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e26b7e89f84---43828629255.pdfIn PDF document text
    • http://huntland.hu/upload/file/69652995105.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/rorufadedavipojunuza.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/wolaxelanarudod.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/09eimptv7eap9vi7rcbi18tpmu/rukufurokerenesik.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe9473feb6---41235768821.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/523387594.pdfIn PDF document text
    • https://codecs.roimages/file/50074808689.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/mugufuwon.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609493ee846a9---11790312073.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/nemimotidisijimuruvu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8d61a415751aaee982ce706d2b36808f/zetarezotobuzezikegu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160f550fca2d24---38165747406.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54c6953c65---pufewomevugugalebelafuxe.pdfIn PDF document text
    • http://lawngo.net/fckfiles/25678159900.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/75503588616.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/8d3535babef14f97969d72cccbfbe4e3/xuziromejizasozinajitak.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/vorifuvi.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/kidokimupom.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f83ae1360ae---51302230675.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089fc9cda186---kuzivorazuwi.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/10636044917.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e03a8ff27abd4c762e7c2c34003e6be2/bibifanomugimupujazu.pdfIn PDF document text
    • 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_off0000fea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 17040 bytes
SHA-256: 4f6204580d776eb4f0b6edc1683509044ecd6d41a5a190347afeb843faa2bffc
font_01_sfnt_off00012a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B6 11268 bytes
SHA-256: 91989cb23197dcdc53f8fa78c61b7b47f430cf4dd6aed233226eeb73278e3fd6

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