Malicious PDF — malware analysis report

Static analysis result for SHA-256 15471c1d15406732…

MALICIOUS

PDF

89.5 KB Created: 2021-07-25 08:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8640be599faaf3b7a6dbb1eb8799d902 SHA-1: 902bfa921a8e7ac868b2b5d322b19ca4d9c98dee SHA-256: 15471c1d15406732be247f6a153421bda5f70626aca5ccc88a8a4b90928019f3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gayaarchi.com/userfiles/file/20210519032858.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7afbd527e0---kogokejowatoxurabadarir.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/91201784241.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/76618562407.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dc9855cbb---merapuzezoxenewitogur.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70f28b3ca---tudapenejusowetut.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/77642594743.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/dipumavoxuxuli.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfef4c001---52691688634.pdfIn PDF document text
    • https://iword.de/userfiles/file/tebiwebu.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210503141337_1999841586.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c96ba1965---likafum.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b8cdd0a1---74459097986.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a70eca733---kekewobu.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/saxoxamozilewejajewal.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/72333348547.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/kojitulefososaxasanevok.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/zisometatagiveneko.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a150c69fc1b---86679044935.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/susosafugofoximupavareke.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/67468586090.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/53584582279.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/kogedez.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vafisabig.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/xebavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=multiplication+worksheets+for+grade+2+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_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 11292 bytes
SHA-256: e306147dad042eee2a3189edcc59f583e6c60ecc3061db193e24d1fe39dd72be
font_02_sfnt_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 16680 bytes
SHA-256: a1af4fdbec6061aed9a8bed9afabc22f66e8cf54729093615c04061726a29ef6

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