Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d18045c80629a72…

MALICIOUS

PDF

90.5 KB Created: 2021-07-02 18:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d99606ae7d9be5a7b8096a4456c0b153 SHA-1: c33945259806fa8e05a5877a4e64649668f0af82 SHA-256: 1d18045c80629a7276dbc340b159bccc8bb650d8aa1994ede49b4246e6ff8ed0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous URLs on compromised websites, likely to trick users into downloading further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5ee76b9b580da994fb7cf518139318c4/xipubu.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2231cf99f---zogadisipobezizezivafugoz.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c2c68387d---tobopejupuniwowaza.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/d67330682e42aadd90d1570caf035cda/10763062418.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609322182c9ff---58415424140.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/35235713398.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/nomojapok.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/vinotomosun.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/c7j0r27d4ric5042hol9b2l267/83827748893.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c12343fe36---26555923197.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/tixovoxogomemiwofujejoro.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/8b6fc286015ca3302934aa18cc2c0889/43055021832.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fd480f902---rekorizegoxujepi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/de79e9696404aaeab478d5da21201768/83413047916.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160accd0ced76a---ranadosovuja.pdfIn PDF document text
    • http://ridendo.cz/files/file/98358939395.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/15285729389.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/3299155038.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/jiwuzupejitexilulugutapov.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/995bb1d7b8a4965f066cc951f2af19e7/sorit.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/majadedit.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7cf548db2a532bbae27dde1346048b85/wimotiperiput.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160877a6b8b687---kopariwolazulizixenofar.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/5d07f1da7ac14b5127e05c2a263a0747/80701467686.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/38789192251.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce19072914---gixawuzogof.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a94f0e54---zarokofowoxozavapiwagaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=exchange+rate+dollar+to+pesoPDF 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_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 10784 bytes
SHA-256: 74d104866b93ca0424259272f84fe4987c6db44dc88ae8add2ec622297237a1a
font_01_sfnt_off00011835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11835 17060 bytes
SHA-256: 39a5dce6a7ed2c11f0d9ae800b744e8861dcf45a1e576c479f2b26ae723ed964
font_02_sfnt_off00014478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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