Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1d5a4f06ff579a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 12:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db13ebf9f69dcecbd2b2dfeeaedada96 SHA-1: 6b0590a908e56d8e3c9fc6ea3bd147294322f6c0 SHA-256: 4e1d5a4f06ff579aaa1239dd4c46e1a56e992ce460e345f386299f2d74af6945
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to numerous external URLs. Several of these URLs point to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://boschvietnam.vn/files/usersfiles/files/31429446529.pdf In PDF document text
    • http://www.aqsclimited.com/EditorImages/file/43296564768.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/bonobawupaxurazoninepara.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/gonikipopumiluz.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/rekibiwukilodugujamari.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/56fa955af294e01219495b69cee14cc1/basagosejogomamanurevapej.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/lojatakuzivarer.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/72368065066.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/90b20945b7e0e2478606b5d1b86f0e7d/74014365173.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/sosifaz.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/rowenesurevexetemokipaxi.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/mutipijaxowe.pdfIn PDF document text
    • http://slsnn.ru/content/files/35595001497.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/12048111df32880189f8a7aa5233ff07/lomomuvololatasomamafaji.pdfIn PDF document text
    • http://hotechike.com/files/files/segogajigebiviwopa.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/vetuw.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92986667cc---50382424284.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779456c7538---12399981987.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/691afcdd082d95382f0047c5dd47b7c5/mipusenokojezu.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/56019047060.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bbc000aed31087a09ddaaae93269264e/1176655896.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1857eb1a2efce4a48724f5db093981b2/rakebanosedodeliwipivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=children%27s+english+learning+books+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_off0000cc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3E 10976 bytes
SHA-256: dab5b5cbdb6584bcb90816aa1c1e75b78d9d1dc94b7143c4c52acd88e7fd4e50
font_01_sfnt_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 17584 bytes
SHA-256: 971d681232f9b25e65afa9908cd63319f457388628f809a51ac9c7fc99e36a7f

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