Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d9da2179857939…

MALICIOUS

PDF

116.2 KB Created: 2021-07-26 04:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43d145f47b1c4eb0758038ef08211b05 SHA-1: bde2af2d3c04a819b5683f79da45cf2aeba79fa6 SHA-256: e9d9da2179857939e8021091010aeb0984e31f321359b76f8033cfd963e1d70f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which host other PDFs. This suggests a campaign to distribute malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent, and the structure is consistent with a spearphishing attachment used to lure victims to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55df96f704---xipomiguxevowe.pdf In PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/jibewigumuzukazotojigosa.pdfIn PDF document text
    • http://afro-safari.com/upload/files/tajiraz.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfcc6dca82---98488127197.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/79649203771.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f824bb7602ac99757aed1c1022b4bdaa/zivesitavejoni.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9815280589.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/b383ijq0fg15gc72h40c5l6gpm/temaxagosoninejolos.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606fadf8cc7b9---zelusatemiwuwimebej.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/14944286213.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4e2604512aa06416eae88beb9f6a9e07/20031054119.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3e58ef69---23174098113.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e403e90af64---70521386006.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/e7284ae28036e52d3674018a48554442/fesozux.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/jivezemotoru.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/46354488328.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4fa6103a1---fofakorerenegivu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d6e5568f9---sofagenalojufoge.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/nelepuwezuxiz.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/cc9b114de94d02cd95f85791c44c77b5/24784327854.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607a697213999---gegegirutipedumuxiw.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/33798050109.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee93a60e593---2408554173.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210504044740.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabc34daaa---kaxapusorimopimuxeduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=does+herbalife+tea+burn+belly+fatPDF 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_off000162f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F0 17512 bytes
SHA-256: 4659184a6d3b2ba747b812dc3cfdf90ed7971024417804c7e6f2651b680fdb8c
font_01_sfnt_off000190c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190C7 10664 bytes
SHA-256: 016352a3dbe3c68083dd6fefa5758da48f0dbc7075f093358dd14cad24ca7746
font_02_sfnt_off0001a92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1