Malicious PDF — malware analysis report

Static analysis result for SHA-256 8235b53e7b83e7a2…

MALICIOUS

PDF

111.6 KB Created: 2021-09-07 15:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f3a8bd72c8e34922e98a7d55e84aaf2 SHA-1: ab9e6c5e8aa7fd9b96ff23a93e3be27e9b195c98 SHA-256: 8235b53e7b83e7a29f2978e6df04e5f80b6aacdf575cd2717794e1552cb07872
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised upload paths suggests an attempt to host malicious files or redirect to them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da5797269fb---bopowitalalajewulodud.pdf In PDF document text
    • http://nuovartea.eu/userfiles/files/25776772246.pdfIn PDF document text
    • http://poorclarescork.ie/images/labozuras.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e14a636bf8e---3551806661.pdfIn PDF document text
    • https://susta.vn/userfiles/file/kabikubamaputagikudowo.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc654538a---dates.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16091434129cc6---dudotomokaneris.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/jatojedoxirijasedafimof.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/30062513893.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/952a0069c594c0f9129de910de5b9163/pogikefilunojubo.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/eg18dpmvcp5fbknpuipsd3qqr6/niwukazisowodugutagivufur.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/pakovirofokanufoja.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/zajulebumuseb.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609068cda8fdd---53581448804.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/40382660283.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/dk62dorv9d0acfa3t5noudphme/solupona.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/k456lkvrii2nknp337m74p7jm7/2331255734.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/83c9e117b9bf210d1e8f0241f7cdbaf5/53925949202.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/natuzonaxa.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/lutubofafodoram.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e33fe612a92---125967435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cardiac+catheterization+pdf+downloadPDF 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_off00014fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000167c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C2 10728 bytes
SHA-256: ae772ba147f89ff998beecf5d68511aac2f07a6c3b449f6593889a97ac90db2a
font_02_sfnt_off0001806c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1806C 18600 bytes
SHA-256: 7f485e4b5668326bd3c69ded6de58c2adaf0a79297c5411dd47d8e8f93ddbdc0

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