Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12c192eb1cbfd59…

MALICIOUS

PDF

102.2 KB Created: 2021-07-14 06:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2ab13f684091c582f8db2d5b621431c6 SHA-1: 7610e5adfe694561f056fdb054d561d89e49b382 SHA-256: c12c192eb1cbfd592ff1c8070004b2bcff2f4781268c3f8bb7d8bbdb5a3b7f4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/241eeccb386d4a14b5f16c4ae5b0829e/medofonetuwamazomagebesa.pdf In PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/l93pv93ve082eoe0p4r6mtsk00/nuloniruratatijizoliz.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9928361f---92556858486.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f84bd8a75---relenekavodepomonodof.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/zevojobividu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9a531a27---38883696974.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fdff2bea7---watilimarobimupixu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087498acbc83---julopufureluli.pdfIn PDF document text
    • https://flyags.com/editorResources/file///bowedetozuvakonep.pdfIn PDF document text
    • http://zuche0551.com/upload/file/54698996582.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3472a69baf---welazo.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/30448418191.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/11682448265.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/gugetodugarafikepipa.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b381b962b73614698ef746f1bedeaf79/36922517837.pdfIn PDF document text
    • https://egca.fr/userfiles/file/78582841019.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/98782557357.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/56982200126.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//91812838278.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/51334781293.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/2llfg5vsalc4dnecevf48o9ti3/zuxelad.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210628005806.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/kebesomep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=g+words+in+tagalogPDF 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_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 10416 bytes
SHA-256: fecc123c1eb2361285143ab3e56ddd98da2c663d4ce78999ace6d185005a4b54
font_01_sfnt_off000137a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A9 24088 bytes
SHA-256: e326094046b59a45615b216d588a86d7967e81b995bb0f002644fb3b7db2e6b0
font_02_sfnt_off000173a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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