Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf625d08156ce6f1…

MALICIOUS

PDF

124.1 KB Created: 2021-07-19 23:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c785df1191279d34e7c19e1c1b176fd3 SHA-1: ed3a72a714697c4fde0f0333cd7e86fa71e5cac6 SHA-256: bf625d08156ce6f114f4184789f783d9d91b5045012692a36e4df7c3cc2738bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external resources, including compromised WordPress upload storage. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://residenzaeden-albisola.com/userfiles/files/2756496652.pdf In PDF document text
    • https://zoorichi.com/temp/fckeditor/file/30952138310.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/dewitiwofekemibiluvogog.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/21385390018.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ea2d236a---fojusawokamugatelapuxixoj.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/d4d33f22995d1dc1449c564374e637bc/30296603852.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/cda5756c6b1ae63f9aacdbeea77690f1/80794422905.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/jvor6rakqaqfl3n7470p99ecvc/watufesozusoxuba.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fm7rllfdtt6ae2nco2op98tdlj/lepamuwisoxixenowodil.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/94112815061.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2cc5a82ac---rimuvifolafoja.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/c2c62920b0a2ce2304e0496bd0f2e145/69360810484.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7e6ca871b19d74cd00ecfb871bfac71e/sebuliwenizug.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae266bc36aa---kolan.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/30182438200.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/doruwalubodomafovenijek.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/318269c5e37a1839ff90160abe13837a/bowog.pdfIn PDF document text
    • https://soechi.net/userfiles/file/37953980341.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/losifesawamumujubiraruxef.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4bf549071---81470348096.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b5dfdc6a04762bc03b397b13cc038d82/16311585478.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce666a2bf2a---64750827610.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3e26d5fc5c2e5d84ac31d4672a83e2a7/99943071993.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d566a6ef---46964109219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=one+red+paperclip+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_off00018430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18430 18080 bytes
SHA-256: b5c5fe830a5143b0d3a832a570e7e921611e679bfab075a7377a44c09a706210
font_01_sfnt_off0001b3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3A7 10252 bytes
SHA-256: 2313a673c0d9e7be75bcf849f9ce2ec1fd17926875e061dec2276e0944831841
font_02_sfnt_off0001cac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1