Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdf5bbd1cc0e468…

MALICIOUS

PDF

91.1 KB Created: 2021-09-12 02:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df1705c923a04d607bf5a2095e3826c6 SHA-1: 7709a7b181464147c22ad88f690a9fcc676cf51c SHA-256: 4bdf5bbd1cc0e468cf3d55aef393f1c829ab1fcf6eb023b2e7fa0ca396e00ec8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to the use of algorithmically generated URLs and link farms to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=watch+leap+year+2010+online+free PDF link annotation
    • http://www.rannatennis.ee/data/upfiles/files/getunikalal.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/38756519441.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368124684fa---79653951750.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/powome.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/wupaxidarib.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95017163680.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/2741322075.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17014849995.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/31013487993.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e8953022a---3960471946.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gcurq9vrjfe3eiflbikhfnndf3/nupokodupebebuzamurigasa.pdfIn PDF document text
    • https://biodez.lt/i/File/lerejo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130db1b214cf---59394646394.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/susonog.pdfIn PDF document text
    • http://iccarrentals.com/files/file/80539907458.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/pesokigavarifop.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16134a45fcc5f2---vorededijuma.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/85666961869.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/vasujuwakuveda.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/bojot.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/nokuwugif.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/wusunumagimoru.pdfIn PDF document text
    • 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_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 18116 bytes
SHA-256: a9b68cb1090b4ab8c00c15249ba7d5f16a1432ece724424383800884af56da0c
font_01_sfnt_off00012dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D4 10808 bytes
SHA-256: 427c79d96c61ca39333ae7720720e6770b657b1b547de110c7c43432ead94198

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