Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c177dce76add22e…

MALICIOUS

PDF

79.0 KB Created: 2021-07-05 23:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ae49d7d39dd45c67f0b07bdc0c997f3f SHA-1: e60db5c29ea64554c2e9a8403732e565bef41915 SHA-256: 5c177dce76add22e022184e54a66632d5dc32655808820a763bf5727208c2be2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and a link farm structure strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://akproauto.com/nbloom/fckuploads/file/jikolusutoxituwetuwopa.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c54e73337---98402072562.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sijigumonovotalugi.pdfIn PDF document text
    • http://derma-dts.de/files/file/90142642219.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/jk4md67qk9hjeoteeuug88b7ch/40670840127.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/hsjf7c1dlptrreiu610p86gomo/38383593383.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b7f8dfaf5---poluzuso.pdfIn PDF document text
    • https://ridersshop.it/file/55258427856.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/piworimukevez.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/suliputusifonarebugej.pdfIn PDF document text
    • https://aneri12.eu/res/file/82170007773.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/fbubtl05i7a02mtvmo0j6v25hq/19122369725.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/d09i9uvdvjip7jrpqpeclh4f5c/39307718370.pdfIn PDF document text
    • http://hydrem.ru/images/file/50014134144.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9ccf0b1d---94083517453.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fa11436c6f160fdb518587a8b55f42eb/83819887102.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/27204145273.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077892c379ef---75938427034.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ed1569352---xosumuzuminovejoduja.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb03674a39---34429712601.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42a4b435e---bupagisuvogetigil.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/q9vi2l4lnbdigjrc3iq5oea4qh/nipumivasotinegizupadi.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/39681569006.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/7281718607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+heat+released+on+combustion+of+180+g+of+glucose+is+used+for+the+isothermal+expansion+of+an+idealPDF 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_off0000caf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF2 11752 bytes
SHA-256: df43e103d9de3e92e7c7b7ff5df14c51ec37b6a66c767b41d5004845e355e844
font_01_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 18008 bytes
SHA-256: ae97e54c1026912d948ca61132be841bc9ff791cef8e747de63e47b1321b4da1
font_02_sfnt_off0001152d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1