Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2399fdcfbbad0a2…

MALICIOUS

PDF

95.9 KB Created: 2021-08-15 23:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f750c1adbc9a68f1cdba14175b30d666 SHA-1: 01be15e99447ea72d0a4491a219b3e8282abcc60 SHA-256: e2399fdcfbbad0a2bc3875c9ecb24efbdc32f32ee647e06fddc6476f498f851d
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to host malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common technique to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c9c334ab345465729b11a24bf3cb2d95/11498718392.pdf In PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/pazexutudatawibatof.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/72876550453.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608095c17541c---15502349898.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/46998474460.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/sodunuzubiparusun.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/fikatipola.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/1e9qtlm49pqjcabt0e2oeuarch/fenaxuxuxobuvowovi.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/31266540856.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/riluretenufitewe.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e92b2ea9f3749baf6cde5d22c11e4c77/82777455963.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/soximimexu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088a1bf31c19---nodaxufosuzax.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/luxadajotinovo.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/gemusefipu.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/satuzetotojevuviwagaja.pdfIn PDF document text
    • http://starsunited.at/upload/files/tibudajakot.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/k022itk98u8vk8mpa5v4td1heh/41595668305.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8ea2a119---52177906449.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/9161890003.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/k8ql3k45rm3le3ce151cr90ca3/tilatozebofifu.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107101820538920.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/308924681123f413dd20a95dad450814/64858022253.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9805186064f106ca9d2ec3b0154ada1d/45148663819.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cdfb7f687---56936206906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pes+2017+for+psp+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 10732 bytes
SHA-256: c8948f839a9c00f4434f8ec68a475aba6312c57ebdae851be46178cb6df7b51d
font_02_sfnt_off000128d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000140e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E8 18092 bytes
SHA-256: c5ef9591798cbd6ec7a33482c5146163e151835cf0d81e51314eec14ac81dda6

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