Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7066a1c16ec9cb…

MALICIOUS

PDF

74.4 KB Created: 2021-09-02 14:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bba91afe0df590b5e839452edfcc8070 SHA-1: 5a982ea297a3f3651b726f5ebcccf853fb81d118 SHA-256: 7a7066a1c16ec9cba1da531cad6d9690a6b19d9ca8fde17c68ec489be81294e6
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised WordPress sites and disposable hosting. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly suggest malicious intent, likely related to phishing or malware delivery through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://e-sportis.com/images/upload/98345006967.pdf In PDF document text
    • http://petrduchek.com/files/92139233686.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/s2do3vjl4hcaigg4c6ndob9po3/gijomiturivujifikamazuseb.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/kiligigazosanagajaralub.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/punaxosiluwe.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3b3c46b12b7fd9c0c04c80cbcd05434b/44649059426.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tp7bcc2rqlgjiorphccdbq7364/butewatezafex.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/j9ofkh5lue9vr1e8mhac3e28a6/85825856647.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/o6ekkr15nbrrj9q3cibdufrkcn/56764405308.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baeb589585---27564280592.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a50311c6d6c---75084416514.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96f9b9ae6---35112457817.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/j4985bmndilpab21um3n3g140u/35466267693.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6cf3411775d10a3375ce18cfefa0820d/norikometotubesijobinajo.pdfIn PDF document text
    • http://fittbikese.hu/files/file/werodutojofutaratane.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/38761067955.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/11092750655.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb5da1be0d---64696148393.pdfIn PDF document text
    • https://birudongker.com/contents//files/durakepud.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202108142050049406.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/791c4aa8edc7884bf041ec0673788a5c/mazixupom.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c124bb98b9c---71365162658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=energy+audit+project+report+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_off0000bcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 17660 bytes
SHA-256: 9e82f13092d591cc2ab5122ce005b97ed9ab9e180bde1d108064060f5e1e77d2
font_02_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 10908 bytes
SHA-256: fd8706c4ff42926951dbe08718bad6a6d90603b30956b74237a791f907fc00b1

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