Malicious PDF — malware analysis report

Static analysis result for SHA-256 232d6c18ecce241a…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 09:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 428e2cd27b8b306ae8ed8f80673cc59c SHA-1: 897e948a02d03a348ae59a78bc2f98bd47439066 SHA-256: 232d6c18ecce241a78a6edcc64dfa367cd6633b14c7f17d8d183dc0d6a88e390
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous external URLs strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://acunambalaj.com/adenoto/upload/files/mirosivubabidezur.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e71df47450---22015897215.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/57550993581.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/serupajugatutepowap.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/87808824302.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/64275366508.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6d0d8063d---83059881180.pdfIn PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/totorubij.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/87808b6f2085808a2ac35c26d01ba6ef/34506312167.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/39514242654.pdfIn PDF document text
    • http://bociany.sk/media/file/63346228771.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/wunuzizimagimeme.pdfIn PDF document text
    • https://senfina.top/uploads/files/30474548647.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/movujizovolanivexed.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3845969129---72186961829.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/83338780198.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/kijorisimiduda.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/zolisojebumukose.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823bc34a3ab---797708564.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6eca7abd4---kuxavupefele.pdfIn PDF document text
    • https://dm288.com/slicice/file/35479952965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pdf+sop+posyandu+lansiaPDF 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_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 16488 bytes
SHA-256: 8a81fb62d488ce1e370bd6c9ffd81f9f9042ce2b651444436fce2c19fa3671b7
font_02_sfnt_off000113fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FC 10376 bytes
SHA-256: 072e2e46709b7962c8a303b44bec11b141a7f52b27830d743d5e033d95a52fdc

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