Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb80164ffcb85d0…

MALICIOUS

PDF

95.0 KB Created: 2021-07-26 13:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 502342296927c7cc307ebba5b9e8a562 SHA-1: f562cc97ab01d7286d926132df4b5fa40dcda870 SHA-256: 2fb80164ffcb85d09781068f6eab398276ddc8279e8f958ae2c947a218522ff5
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 contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of these links and the overall structure strongly suggest a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab55849fd5c---filemazotazu.pdf In PDF document text
    • http://geredekombiservisi.com/userfiles/file/rewobelibajoseburudesogal.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3v3n7so1g213p6o4scbhevk7vn/45859419297.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/a8480f5a9ea4659d79229b3c35e9f519/zozapezimitarefexisumit.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/69313807681.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/59821664452.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/gemibipelofibunogababofo.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d06417fc9---fajadi.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b32dfe291d9---mijozudediperar.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6a93a9d2---77108746389.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/xomizokamomelixefosuxova.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/918a91760e3d7bde9ba7120c8a46e7c5/vinexugalus.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e231be48552138a7c5f8af3e76dd9eb1/47729529491.pdfIn PDF document text
    • http://talleresjpg.es/img/file/43030166487.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/51929777953.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9dd1bfab9e6fbaefe824e5b8d0869d77/bogorosubajala.pdfIn PDF document text
    • https://sanagustin.cl/files/55201653744.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/860c8d7d5e79718798e368c127128147/38071871879.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/fuxenad.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b21a475d64---63997496270.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/923635f77c470ffe211c54cac0649f24/worunoz.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0aefa56fc55c5736f2190ce93f7b74b4/konugomag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=reaccion+de+combustion+quimica+ejemplosPDF 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_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 11136 bytes
SHA-256: 62287dc0cee5ccc0f5e9b929defcc73c66ac446500c301fda074acea80129abc
font_01_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 19756 bytes
SHA-256: 57f9fd9326f808c739d97e176efeb62acbc17097f589741d834a2f2461466845
font_02_sfnt_off00015462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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