Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5e2bd66607373c…

MALICIOUS

PDF

89.0 KB Created: 2021-06-29 20:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 164850a11fd30828ef67db636810a01e SHA-1: 39800ff28a6ac177de1b70d4f8c9c7eb7d052b73 SHA-256: 6d5e2bd66607373c04eed8ecac24af4b8b95e908d11e9235d4d66fd2094a3e46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/415462531.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2ba53f2397b31192e554dc8e49845e33/toroporimof.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/5380527298.pdfIn PDF document text
    • http://htwy.com/upload/file/20623929836.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/99086052487.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bfa8b405---letugelabalepafunagaxi.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/023f4cd3c22eb77c2174490f8bb24c98/74876095813.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/sobaginulexu.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/93303d3475601f131946bd9e2e11d3fb/97956764432.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/womaramo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7ed2878a---jididazumetiv.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0cb6q41l9c124mcoeg4rkaioc0/2715452588.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16084733d7d13b---jifijosikuje.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/f6ascks3j7vhvbtt0i4ots8qb4/97884196318.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nojulurixutenomakev.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/kemuwuwanoreruxarafuwix.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c584633e293---61115063396.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1d61ad2232180c65432dde80a7d7bc14/vakaregubinibiwetu.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/figugenijig.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/56823765431.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919e7e6f4b0---32622779104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=environmental+issues+pdf+downloadPDF 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_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 10892 bytes
SHA-256: 4afdbff2b615a6f5c391028206d89fb1a5b4d452db20819baa50316c5c4338bd
font_01_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 17896 bytes
SHA-256: 774bd61ee2433d2e291f250bab770d578abe111e308dbd09679b5d94bad25f73

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