Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ab4ad1098b687c…

MALICIOUS

PDF

86.8 KB Created: 2021-06-29 07:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53b6e4bf7712beef2f6e86239157ba29 SHA-1: 2fb1ffc772b0b52e2f2465a729c7b6360872964d SHA-256: 54ab4ad1098b687c787bb642e8b22ddaaf1b992c448a9a3d2d1876dc8ffed88f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://synerhu.ru/uplcv?utm_term=xxx+adult+coloring+pages PDF link annotation
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc107edcf2c---musezapajobasavaju.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb14a625bf---vekojulivetomosizogot.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5651101ae769e805977b28f6f5dadfc1/80219094426.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/99j1of179t9q0671o0igkicgi2/30828092522.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/meneneposunupab.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/genupuwog.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607743096b387---modilutimagekuwetofitokak.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/gigil.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/jelulusupejexasan.pdfIn PDF document text
    • https://wsbtitan.com/images/file/24532096790.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/56252791961.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/0381l7phi58418j6oebm22kmsb/relotimeneboropexalixelis.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/96753788677.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162283576419.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/603a228819c801a3bb97a6b273e5c11d/punetegugevosinir.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc8defb16---34553788403.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fhc14ti3a3uf2ujet10cao9e37/litewemekape.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/dd11207fd88e7631ee4359b276ccd4d4/76762718399.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/f6eda452fd35c459899e530cb7cb2b46/74039495806.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/33efb1f8439577aabdb2902522e34630/gakasonuzad.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/71d87ccece49ff4989f7138c37261d64/kibevoniwojevizijax.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/ximenikefegatin.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ca3e14c8---32348161293.pdfIn PDF document text
    • 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_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 10900 bytes
SHA-256: 74f9db6c105668745ac327be294e6b1ea2f93900ea1be054a4d63e8eff608620
font_02_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 17348 bytes
SHA-256: 32a017f5c151104b39fd223fe71c9f09126fafb273b47f5371a5e5e4b54acda2

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