Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e15ae9600c1e6b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 15:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21ce41c7819bd5c5ce28b2b067b34d7c SHA-1: 8cd4e47703ef7324bdc07459160c1ee715438c85 SHA-256: 55e15ae9600c1e6b89e2e6bb13a8d0b395b7b97a1388500f388b911e4ec31e3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised websites. The presence of invoice-related language further supports a phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://hart-metale.pl/gimnazjum/userfiles/file/polilo.pdf In PDF document text
    • https://hunde-katzen.at/soubory/79869649118.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c14dcad9e---mokixuj.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613803349e2c8---54523502682.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/56395134027.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/xajudoj.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/49340062975.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/74993827608.pdfIn PDF document text
    • http://movediary.com/userfiles/file/16250991616.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/jesotizevenoxukebasu.pdfIn PDF document text
    • https://combrooncom.com/contents/files/52805964151.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab26b174e---goloxufolu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/43aa90cde55272eaadd66ec8d6c479b7/87271821786.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109061206421122.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/nijizijal.pdfIn PDF document text
    • http://sdds.be/userfiles/file/gudumokunu.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/fimusulovusifenevek.pdfIn PDF document text
    • https://hirurgija.me/files/famovuwaba.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/lbrvg9vjuvi3k8lpahsc7cgi03/wogalegotidomidegofem.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/35268672931.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/woviduf.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/kixojivukew.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/xiladosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=open+instagram+private+account+postsPDF 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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 17848 bytes
SHA-256: 78cea6129870de03a5146b3017fbb6d57109135c117cd1c53ee8557e59cb47eb
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 10860 bytes
SHA-256: 8bc43821c9ffaa6aca4664e73399aa3b59f86ee0873cfa7956b171bcd2317ef9

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