Malicious PDF — malware analysis report

Static analysis result for SHA-256 578ee7fb489a967b…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 02:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 588741b9fe717c3663bd285ed61f856d SHA-1: 9197cfee2f07d9a9a65b540054e990884a76ab33 SHA-256: 578ee7fb489a967b69c24c3c51b01d0cf85babbbe3e9484f9fd13eea5e4e2c17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://petek.biz/resimler/files/kimisukesunuverupona.pdf In PDF document text
    • http://www.sudaff.com/pics/file/levozuvixadeji.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/nidirubel.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/zaleru.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/84634179a7519db0b63510646776b643/muzawunasusanopifiv.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/775472912d63cca0636dd4be27a4cb18/damibemuzaf.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/dafff0d00dd45f3a29a34192c5dfc586/nojifis.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/4631537531.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/63482540897.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/45812107999.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/kojarekajilogerodivo.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/38154674946.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f994e23af---48845817266.pdfIn PDF document text
    • http://wirheiraten.de/images/file/44046406004.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/16457971809.pdfIn PDF document text
    • https://telorgabus.com/contents//files/dalutatuta.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0575d57367---10714299266.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/48791241638.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/suparirakuvebavanevifuki.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/kafawewamivevibimafo.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/de4c63e7a4e91ef0093f4154c0b61134/21132857618.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/24034320984.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/81053878630.pdfIn PDF document text
    • http://scsychem.com/upload/files/60087624652.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/fe0be8f6c9537c638dbf22fa8abdb6f6/91548370478.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/65986491706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=body+by+jake+hip+and+thigh+machine+instructionsPDF 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_off0000b962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 15608 bytes
SHA-256: 2249ae36d476cc099e451f6ac10b424c5d139d759c426393957d778ea5b133ef
font_02_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 11544 bytes
SHA-256: 6754a5457fc7dcd8bf5fbe34b85aca86bb4ba3cbe159f44345052c35dc63f3f7