Malicious PDF — malware analysis report

Static analysis result for SHA-256 037c2597cdb3dd68…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 23:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 161a5bd64a8570803dc236a98ddbc117 SHA-1: 9fb3c2a81c0fb6863d244375163167f0af37d0dc SHA-256: 037c2597cdb3dd68c9b2f7655b9a739af3cd7266992ec4e22e2082f67a6b5b63
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to external URLs hosted on compromised or disposable domains, likely to download further payloads. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass gateway scanning by encrypting the actual malware.

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
  • 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.
  • 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://aljazeerahdrilling.com/userfiles/files/36449957445.pdf In PDF document text
    • http://ndt-tl.ru/upload/file/xudirotomulijenijodi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160770d85e3b23---53432256031.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/30664851428.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/51920583732.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/remivoluraladikasoto.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/tabivekive.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8931cf0aa6---nunolefuzelexor.pdfIn PDF document text
    • http://hrudolf.com/userfiles/49658289818.pdfIn PDF document text
    • http://nova-auto.com/upload/rexukiguzaxenaguzux.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/47339156331.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/ravunuvenubawo.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/jumuwobiweledo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b897fa24517---vupoja.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/rokilomol.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/38642844151.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210726120324593.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/viguvudaruw.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a21ab12b0bd---70094061526.pdfIn PDF document text
    • https://lesura.net/userfiles/file/firulepakevup.pdfIn PDF document text
    • http://email-database.info/userfiles/file/pixidoxadixifiwew.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/wavonol.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b66e059b098---67451200434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=t%C3%A9l%C3%A9charger+adobe+pdf+macPDF 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_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 10860 bytes
SHA-256: 189cc49292dca192b5808dbfea1a56036b6cd797a179db3887fd12bd023c41e4
font_02_sfnt_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 18928 bytes
SHA-256: d19acdd84ac89620c0bf260621440b1ced26b9b38964cdcf32b9755a34159976

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