Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7b33e792e77a82…

MALICIOUS

PDF

83.5 KB Created: 2021-07-31 09:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c458fc8f262eb01aa8e3b6ee3269cb97 SHA-1: 69acf3f2bf425ec6da7a5d92fdfa7e70530ce0d1 SHA-256: 9e7b33e792e77a825849800ac965ef6cf59a222f2bc68f136bdd325e8965759d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting it's part of a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially malicious PDF files indicates an attempt to redirect users to harmful content.

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://banphimchuot.com/userfiles/file/53513722426.pdf In PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/da6d7d35dc0268bcd07adf0e78fe9086/874069727.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0c68263ce0fdf24471d1699777e96824/nejiwavubolagusiki.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/mijuzagoj.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0230bd6cb1---65545106261.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d60294b87---ripugiwugifiv.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4162e6e0e4---67668198419.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa2e468c4a---kexedejijaresereta.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/sonubamulotaxok.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/tezekij.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160840f40606ba---bivamufivoja.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a5f7e6cf---wifexik.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3cc92dc591b28e4ed366cc8de86a9569/93080532560.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4f84497c344dbc4ef7b1bfae64520b47/30284218884.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/fobuj.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bb8e56620a6779ab484ab09129894513/xulekixiwazake.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf9181da1---tafefifadumiresusavozas.pdfIn PDF document text
    • http://sooclose.eu/upload/File/bopet.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2da30f3f4---63629232446.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609deca99da95---gatopuwutivomebebolej.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/65468510278.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a2663222cd378bd26ed1b28c8f754500/rosekaga.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/rowagituvomibanep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=percy+jackson+labirent+sava%C5%9F%C4%B1+izle+altyaz%C4%B1l%C4%B1PDF 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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 18304 bytes
SHA-256: 094aef5bbbfded21de88d86ba35f5111fb4be4720d228a72aa7a3dc6fb611650
font_01_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 11112 bytes
SHA-256: c6acc030c75ba6f192bed5d07191bf9ac87098a0c3f5a59c8da98b4332964669
font_02_sfnt_off00012589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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