Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf048c8d5feb9ee…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 19:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c1774216d7ad0897734470f124f5d24 SHA-1: 7c035bcb6d6873c003bd6483a25575f70dca660b SHA-256: caf048c8d5feb9ee568230600faf520552f8c078bc04ec43a5142373d27382af
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple compromised domains indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.paseppe.gr/ckfinder/userfiles/files/88175960152.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607418b92f9cc---gevunamulatuxukopexelizi.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/dibelabesabazovenurofi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e4077cac4---sufajisododokuxati.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/fagofusofep.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a677a58251e---46134345408.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/611522663fa43061adb864c6b71083ac/dupuxuveperuvi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ut28lna61sadppmenkhvc98olq/93587699207.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958819ca347---pujos.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/31103473995.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/57015738437.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/0ceb51851f0b21c70dcdd54eb5d07523/pibiluboxuku.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/webirunakobu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bed0cef25---92691869663.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/leduxar.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/82311406264.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/719deq3j9l4qlfrmpae6csd5jl/xiwelaveb.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/86609001692.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/82336162140.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/78416557830.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/nobaguvoxif.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/majoz.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021080612540173499.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074375bc62b4---fimusosinolateso.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e182bfe1a15fe318aec7fb5e9f37b954/66967404950.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210615_214218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bellerophon+myth+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_off0000cbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB4 10508 bytes
SHA-256: bc9c4af8a8cc8bfd0eb4c3b5b3b91b4bd31b69552e6311406d71bc0191338d78
font_01_sfnt_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 17272 bytes
SHA-256: 335885e3f2156da9656334e810bf90a61c9b28be4e30a0c8ce81c01dcc4fd725
font_02_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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