Malicious PDF — malware analysis report

Static analysis result for SHA-256 392a9016680fb91c…

MALICIOUS

PDF

83.9 KB Created: 2021-06-28 21:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5c1c2659a06a0d19069d88863749b600 SHA-1: cae2c0d33ca0b3552973358c1e2078cab7773e5f SHA-256: 392a9016680fb91cbb405fddf2a7d8566277d37ca44a4fae47f65685660fb332
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The 'SE_INVOICE_LURE' heuristic suggests a deceptive intent, likely to trick users into clicking these links. ClamAV detection and ML classification strongly indicate maliciousness, likely a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://karpatskiles.ru/store/files/60290805153.pdf In PDF document text
    • http://westernmaki.com/uploads/files/73847599771.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/37896028086.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160966b958344c---17128662602.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/98206993248.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/94934238280.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d4745f909ec9de5758b73ad180717b65/79768498221.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/80dfd39d047913222a9b5b5a98f89d57/85382306581.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/78602950712.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/fd1b99a34a45f90eda75ccdab8912ec2/tidov.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/99730305738.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959a53826ed---wapoxemituvo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8hvcjukhiefuv2asnbpj0nvnf4/84813832.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/idi84n1di3kf4khg9t0e754fl1/69209322866.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vcfq6odbucoi4r2sc0nm39pao0/tojukipakijoxiwodopi.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-9/20210609165730366029.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210523181523103.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/6tctdrvleti7gudos0a66tageg/bebojekejafida.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/cbc5172f55de810c2b350114aa8b8b3f/76344365310.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f81f369578cb454e04b70190620cdee7/sofotefusanilizeta.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/308e3q7lamgb89ta98o0hh1dv6/87918732399.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/xezivugefizipogonutafe.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16077471738f9f---24430701786.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f4b91cc1bfc14003c2e6cbffb787417e/8517219324.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/defuvawewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=omr+sheet+download+180+questions+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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 11500 bytes
SHA-256: 8fd1e3f4d625622b35a949a8c80c7a2aae2e7d2ccce9dee9f3a133a9da3faf06
font_02_sfnt_off00011098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 19316 bytes
SHA-256: 459e9091a03868ef70df1170de3c3f425bbe5126efb95c93be11f9f82db68833

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