Malicious PDF — malware analysis report

Static analysis result for SHA-256 284a7f056e8fa70c…

MALICIOUS

PDF

89.4 KB Created: 2021-09-03 05:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c503bba8fa3a657080174ed3ec4cc5d SHA-1: 4887d5db6e359c0ed8a4c89de6575217a2bf35e8 SHA-256: 284a7f056e8fa70c485e89893e0fa9ba6fa319700c063e10b76ac1ef9567f032
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Heuristics indicate it functions as a link farm, pointing to numerous external URLs hosted on compromised websites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/2529669017.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16103e3f265ab3---20968350829.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/71329904152.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec97841bb1---dudibovemizuvinajikikosuk.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/gewusunufuwimo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/e4gueptnbadfcrr1jtjb9hsjis/bukonibu.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/nemikil.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609780ff51d09---61348046799.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/dujewufe.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/vupawesareg.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/31919730395.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/nipemosasibibuk.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/34301579903.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501015749556042.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/564d825f70c83656aaaad6c93e631f39/xumitebivizul.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160716d4cd407b---nepiwuxomoxerowuj.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/75430989931.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/49582190642.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/78958366478.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/fotozazopupejonopada.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/baxatipugeliwotu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/1dbb488848262aec296e5301410a97c4/pogaxemax.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/senori.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/wibekolog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=conectores+en+ingles+ejercicios+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_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 21128 bytes
SHA-256: 020396dfa9b08f7f43c151a05ca52dfb4402c397f56578eaa230e239398046d8
font_01_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DB 14460 bytes
SHA-256: ddf3cec4f0e3fda0023ccbca3c56fe528733e3f3912f22a0bbcc4ede3072d480

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