Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda2ce863cf187ba…

MALICIOUS

PDF

70.7 KB Created: 2021-09-01 15:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1750ad748d6246febb0fea422f0cd372 SHA-1: f49e4ac7a6020b05eddb7e5c6f79f2625997e131 SHA-256: cda2ce863cf187ba6e4d89b9b605c6fd6b42d2dbcd243daf050ac5b44ee57fce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS upload directories or disposable domains, designed to redirect users to potentially malicious content. The embedded document body is heavily obfuscated and unreadable, suggesting it serves as a container for these malicious links rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pixomot.ru/uplcv?utm_term=high+minded+idealist PDF link annotation
    • http://abwalabamaave.com/uploads/files/delawazugilaninugoj.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/towujonedurivaxi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/005651e4ac698d19bc12ef58037ead7b/demekekojobuvolowibek.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/78491677906.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e61f564b2---runofilo.pdfIn PDF document text
    • http://japhina.com/upload/file/jupimeguwoxuzu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815c518fdf7---terevedigepoguxet.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/85923280982.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e055a8ebb7a---34734069629.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/6263eac70024a8b2394445fa07eede59/60642912587.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/764fe1322b6e7b223e729dd21cca3d68/72788754897.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/be46a30481cba431f6eac70ea14b2609/femekaneranilalaf.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a32ee71e5634408ef03faf0bb9d64fba/xelubutifajax.pdfIn PDF document text
    • http://abpaluso.com/upload/file/97286305652.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607de85146bb1---14971029857.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/xudipagu.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/zifimezelovifubuxexudo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612de7bc3bb08---48114129993.pdfIn PDF document text
    • https://sealskinz.ru/files/file/lenegogebaxiwapuzomo.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec6d30b0f3---japin.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7845cfe1588fb86d72c05f81d3df8c59/vufojazewi.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/fevupubonanakej.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_off0000b8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A4 10468 bytes
SHA-256: 569236bdbf05cf82547bc7c6c1b16376bf29360c18d431eb84cc6f58bbf3a4cb
font_01_sfnt_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 14860 bytes
SHA-256: 178586b311fa8b7b794e32b4bdd920c7066be1e930b9f4597becbc37f76df650

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