Malicious PDF — malware analysis report

Static analysis result for SHA-256 affe5b148dc403d2…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 16:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f33f1b6702e26a5166975c80d0234ce SHA-1: 069f8de99c5c5ff62e2af700d3f1ee03c42c074d SHA-256: affe5b148dc403d28570799952b09305468e1cafacf657ec6ebe4cabd795564e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://cpghollywood.com/userfiles/files/sapim.pdf In PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/14450308131.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/zisepida.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/nafewegerivad.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/foxurulizof.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/lisenuzenesutu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613425846c4db---72690630328.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/13584695878.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/25396450197.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133a6396a874---lodoniduganajodabawo.pdfIn PDF document text
    • http://ailizia.com/userfiles/43468363564.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366c9c56f8c---wejorefopo.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/24014869510.pdfIn PDF document text
    • http://rhondachem.com/d/files/54393365320.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/60761237333.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/17827778079.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/nedexawoxu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/24913355363.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/fakave.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260dcc2923---343036924.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/ranarir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=compressing+pdf+files+illustratorPDF 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_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 10972 bytes
SHA-256: 4054ff70143c69be2e2ff6a1eabe550da0f7e535808905f535989416dde65658
font_01_sfnt_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 16920 bytes
SHA-256: e3cabe03785a19b838dac6373d2245b8842a56b9884960def3ccdb0b5df53f79
font_02_sfnt_off00011323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1