Malicious PDF — malware analysis report

Static analysis result for SHA-256 128760b42bb02957…

MALICIOUS

PDF

117.6 KB Created: 2021-07-04 17:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cb112ee63c78bd6c0992f2d52b263434 SHA-1: c0d4186fd6c5b7d182f1695a3a61e70892c9a32b SHA-256: 128760b42bb029573c8ee8ae3c7bddf82ee1132a146b4d80c83023773c05e733
164 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URL analysis clearly point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/igct01s3p1lhit7uq51fd9bdc2/xiwinadefure.pdf In PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/xumadesunesitaraj.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/kexusigojijedanupebimijek.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5ca5d53d4---siwuvewek.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6cf85b5e---wazajesigiwosufalar.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c50f8c811640c4d8ff2983aaaa16f93b/sabojaxajasudap.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/19837976843.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949d3a7d5d5---telifadawak.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b67e00068---35812305036.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607703342fbf4---lebuxawipufuweju.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c54f5e3082b---wedolanasubixunavefar.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/h82opoli5gopnie8atvhu8h3j8/nunejaviw.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/wusadadux.pdfIn PDF document text
    • http://labonscafe.com/userfiles/femujipirisobemuvavizukog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f962fce3a2---2190847689.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d9f29fb3319bb5fd3c699c0633eb4781/lumimamoviturusuli.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3523b85d---genexulagerawupadat.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/39305282820.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/88298396166.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d195298d79---39207752991.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/5a1epmijpf9qllnvc4afmar29n/57847846494.pdfIn PDF document text
    • http://ozari-ua.com/files/file/pegupiwukowogebitisal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=deep+love+quotes+for+boyfriendPDF 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_off00016a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001825d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1825D 17476 bytes
SHA-256: b48d233487cbf535ae785172c68dfc81ff7e00cb2ccaf45e4f98694adc00a298
font_02_sfnt_off0001aefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEFD 10896 bytes
SHA-256: eb4e431097bfc9074a61ccee2c059c49a12c2b8b718a7f1f36fe974304a5f3a0

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