Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23a29b72674cf64…

MALICIOUS

PDF

109.8 KB Created: 2021-09-15 19:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f76e61ac04df5ea9ce9dd5594b53002 SHA-1: 8f1f7b126d2ff02905a9a0c085b3f1e874de6469 SHA-256: a23a29b72674cf64f1767fe1041df6237c5f6a44f0540eaa690333a62b96b1ce
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains multiple lures indicating phishing and potential business email compromise, specifically requesting recovery secrets or new bank details. The document also functions as a link farm, directing users to various compromised websites, likely to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://soudurelauziere.com/upload/editor/file/fuxivevubepepurisesax.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613931bf2485a---36762081729.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/zosisodolaju.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/denusepasabiv.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/kevidatezutesorejizexuri.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/jolojogixevut.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210901_9F189265FAB8E08A.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/13261363526.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/xatofesesokagamuvikizu.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16313422988312.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/43250898303.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fonilakemigawinaxu.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jejamovamalamemuzavejupo.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/divugikoxasusafomixaruvep.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec94fc39aa---8422344679.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/5315018042.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/lidakej.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3e177697edc725fd887cdf69fc39ad11/zikosavasi.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/supesuvisipuguj.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/tosajosexevafovesoxiwufa.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/xekudumalejivaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=a+brief+history+of+economic+thought+pdfPDF 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_off0001426a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426A 20748 bytes
SHA-256: bad0b1f52663944df21d650c80fb78687748164c8788ffe273da9f784879e7da
font_01_sfnt_off000177aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177AA 11196 bytes
SHA-256: ec895694587d436d1d1980ac67f90627d40e6cbee9f04ebfe69fad691b465dc4
font_02_sfnt_off0001915e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1915E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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