Malicious PDF — malware analysis report

Static analysis result for SHA-256 3270eb8432d004ec…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 12:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7758fe87b82a0ac683713a40584b7b0e SHA-1: 33c3fbb8c24391510b39686717fd7e9b911498b9 SHA-256: 3270eb8432d004ecc64ae6124809341d68a8b983f64c7d09fccf7acd1c528986
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains a link farm pointing to various disposable hosting sites, likely intended to distribute a password-protected archive as indicated by the 'SE_PASSWORD_ARCHIVE_LURE' heuristic. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://lahma.pl/_u/userfiles/file/lovafotasogurizogiwi.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/s7597m03egjhr3ifplv2ojr2lf/nukowexomope.pdfIn PDF document text
    • https://esvigo.com/upload/files/98941949597.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/83775566646.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a04fb474e---2213665179.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d124ed9f5f---vamijezinevejewobov.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/48864073692.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/3d7e40b303884501f4d209959a249cf8/varozarevolamiwumixul.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/rofudam.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/penigevalusunedosadetakel.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a122b94f2b5---pofemafipebukiwet.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/metabojiruxi.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/98172516263.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210705110259.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/90980739195.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c54432fa3---43775835427.pdfIn PDF document text
    • https://penal-garazh.ru/files/zitixonafizuwavisosoter.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/24841177588.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/63866315227.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/mpjna5q50l2acd556q4k7op4m7/85522859927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=acv+arteria+cerebral+media+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_off0000d09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 18940 bytes
SHA-256: ce9369d33e89b82d3a2682e36baa14598e1f54910f8b31b531ae8561b09a12c7
font_01_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 10576 bytes
SHA-256: 3050acb4f59f176abe7ce39dd5e88f3dc6195fd9b8c36e52893d9b2e5246ecac
font_02_sfnt_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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