Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6a5457d13a0110…

MALICIOUS

PDF

85.2 KB Created: 2021-07-21 05:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2faf604c1080bd16a46238746789cb51 SHA-1: 3d305fe64f9b4ee9416cf9e5e035d53483077e06 SHA-256: 2b6a5457d13a01104d0b13d5512c70443219da09541efac1bcc707f222911e6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5319dc63f---7393998274.pdf In PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/55617995994.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/18467777170.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/53181398017.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/15349093157.pdfIn PDF document text
    • http://rykatd.com/files/pawanexazunofuzozad.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/dotibanokixajonuzak.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16084d31730684---bodos.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/35743183876.pdfIn PDF document text
    • http://damoorefamilyreunion.com/clients/7/71/71c8bb141a0941b69292984b9770a174/File/63872987348.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/ee9e81fa8ce650b01e8082b2ed010dc4/kexemusuv.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90167b0d0d---48031911236.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094df196962c---zamobijovafozofagegimu.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/58853043095.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/lezax.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210606193238178.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d20bd4d85---tiwokunimi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/geriruzitibajotef.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/maxexasawuxaligusuwul.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/95936030154.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/96503553486.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b507ceca4b---kegaragiropilirujupi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efed30c943---lizanenopotiwoxo.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/lumun.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/89109467256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=linear+factorization+of+a+functionPDF 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_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 17280 bytes
SHA-256: 0d21d668a753ab484cd7fd5445357ad094ea8dc2578716b0673c4e1f83f65bf9
font_02_sfnt_off00012e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9B 10232 bytes
SHA-256: 57deb1b9c5f2f3f469aceb15e906c6a9c76b34a8a46a083aec79de7a9b42896e