Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9f015d0a9a57e9…

MALICIOUS

PDF

86.7 KB Created: 2021-08-08 17:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df94624c08fe2fb2f89c54f1570a6254 SHA-1: 698fccad9ad5ffa843c88b44f53346043925181f SHA-256: ff9f015d0a9a57e9e5dc1df56594867fbd7fae71168df66089beccb6eb28af13
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/depovemozaminotizeg.pdf In PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/98307745870.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/mfengldvnf3nl3jq43j17dli05/7902375897.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f9fa2f1f---badivojixamipagoduzop.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91136364169.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/bukejazetamewodefofitamog.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/to097ek8ach9mkp9slkp2evglk/574810130.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/33808428441.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/1225460008.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/wasetadoxuvinivutuvepusoj.pdfIn PDF document text
    • https://semut73.com/contents//files/ginejov.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dedd814a30---zagidulefevudupofituza.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c22727ba---rexuburatarikugatomene.pdfIn PDF document text
    • http://taociren.com/upload/file/210808122903765627f09irjajzhot.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/tajitexotarotefezitani.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/jabiparukilifemebawo.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/gaferukaba.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c951797e716---sovumoxurilidarujal.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/gepufipu.pdfIn PDF document text
    • http://djapm.com/userfiles/file/1201138721.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/k3qauq1atdqdin43qfrsu4a6u7/97408164986.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/zalurakonetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+use+prestige+pressure+cooker+instructionsPDF 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_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 16824 bytes
SHA-256: 8169ef4ab0a8c20978802421dc71ce679e265c8e26b2d4f0ad4be983362a1034
font_02_sfnt_off000133f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F7 10612 bytes
SHA-256: 7f66c25249fbfead16f540c0ef250f9b38ad6fa01bc36fbea78827cbc798df98

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