Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bea09110e50b8e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 08:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb934baf339ad992a895b754312a9808 SHA-1: 75bd59af72d04699c884b57303dcb5e986490fdf SHA-256: 98bea09110e50b8e95f4595e4392b2ef61cb709f6e78229d6f1a3731c2f57dd8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware delivery, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nomylo.ru/uplcv?utm_term=theca+definition+biology PDF link annotation
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d022e44b87---loropoguroxiwi.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/57723535877.pdfIn PDF document text
    • http://swingdesignhk.com/userfiles/zujiwinapiruv.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/u7n6lmmukfedsr2718un8tisp7/lipuge.pdfIn PDF document text
    • http://dhf-china.com/d/files/96000243579.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/15864266319.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/81067058068.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/d7vtfeqtkl8lfpmpctktqv9fr0/74549133508.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/25657845388.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ii73spjcftjjjfm8io7973sh1b/10820613200.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/18vpvcktf4slbldedom8tn6kl3/76030615875.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c946543fa15634b8328364877fe7ef62/suluxexebabiselojaripe.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/99650991248.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160abcead43aea---50723296824.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/zodafujoruj.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103038e439ce---gejepigesuzedunafepimuw.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/jokowofurutidusa.pdfIn PDF document text
    • https://binhvi.com/upload/files/xininovedisuzokasumoxawit.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/cbam2mu7tt5t8rcqvvn03qc4o3/zatitagorugo.pdfIn PDF document text
    • http://crm333.com/documentos/file/wolimasi.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210801_D43487E19B2E43FC.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/44088735975.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_off0000b7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B1 15476 bytes
SHA-256: d512130e7524ae8d69e01810f962ea8a149aef7e19ec2d1f40a68f4e5ed85731
font_01_sfnt_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 10704 bytes
SHA-256: 08de8bdf67a067dbb4c9f8a565820b1dbcfe947c77ef8908dabefa5a178c6926

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