Malicious PDF — malware analysis report

Static analysis result for SHA-256 f332b00193b2ea89…

MALICIOUS

PDF

87.8 KB Created: 2021-09-21 21:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b079287e144c8409286bde23e8eef9da SHA-1: 5dd8463f1b22bcc6190d0c575040b18a9c2e15b8 SHA-256: f332b00193b2ea89e332ba2a6e71c6c31dbe71575344bcd79247a0edabb972ad
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the document functions as a link farm, directing users to potentially compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://citra.cl/userfiles/file/14996947336.pdf In PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/kinokagisela.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/wafovojutefav.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/fisuxidur.pdfIn PDF document text
    • http://kelvista.lt/images/files/8143674470.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/41f69cdf550ad6c5d1d19e078719b268/23196566818.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/70615994979.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/tejituwesek.pdfIn PDF document text
    • https://hoavily.com/uploads/files/lomotipebubijepefilafesi.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/femomasesu.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/vixowanox.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/71940824919.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6a2fa2a31109794daae181a473c9f6d4/ginevagarobeto.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/40804303306.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/91181325113.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/jiwitokefot.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/kasazozapakemajixewe.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/wedaloxewexedujupekimu.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/bovutefukufoli.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613905fe1d74c---giwewexezukubivukowuli.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/84999790734.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/tuxufolubajajisuxazada.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/rezosikugu.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/2608169577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+root+my+android+phone+sinhalaPDF 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_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 10848 bytes
SHA-256: 8b354ffc6542bf62e47be37cb4591cd2f92e8b9481f07190b49458ac2d0cf2d1
font_02_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 18484 bytes
SHA-256: 8e4597dee0e3d2603f11f0a685154bd918d3d7f58cc50071ade815611e9b2b2b