Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1eb14b0105af11f…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 11:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d9034cbe35b6a246a2e785fc03a64dd SHA-1: a69ec00703ee3133d56c6a7dfce9303a90c790b2 SHA-256: f1eb14b0105af11fb03928d8d14c95d67a698a607a034c1c87b2066446676cc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous extracted URLs, many hosted on compromised CMS upload storage or disposable hosting, suggest a link farm designed to redirect users to malicious content. The presence of PDF_URI and EMBEDDED_URL heuristics indicates that the document body likely contains links intended to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c21873c3062---26677603990.pdf In PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/noxazabekamatajofezute.pdfIn PDF document text
    • https://computerzone.pk/file/bidabisir.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f065b17504b---kuwudimozawoniponuw.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/vosufudusazixuxodaviwamor.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/dca5d7c0435b2781f3742847f7dd6984/53308587274.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076925837bdf---77685610039.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/96828683573.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/xiwibodesitedakizuluw.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42c626cb4---35342205752.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2ebae986d---jaxumevaxevifewaxososi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd06681536f---15071965385.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/e5da7a5ba340a53d0e3ddcadfdf47de8/xonowemumidoban.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/werulidemudenurumag.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/34221070205.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/tunovaso.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/45ab88c5d98369d13584f5d28b66cd31/kesagifupunerodiravini.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/939f791152dd704adbb41fc030f0ff8f/povodisexamisizoteru.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/65802665886.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/kunuwireripekixodofusudib.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/goreladewanuwaniw.pdfIn PDF document text
    • https://schmitz.cz/res/file/56428415325.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/34l8q2u857is9ceb442pae1h1e/telufezujosivurudunatep.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/kawesojidopasujixubika.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/likazivomajiromamasetap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=difficult+printable+mazes+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_off0000be0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0F 16144 bytes
SHA-256: 2a5e4cd43ea6b21e299f9b04face8b73e127b068894ee124fb36707ec093a66f
font_01_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 10960 bytes
SHA-256: 7a2f6f02af916444b4d58ad37e4c9c34f57006634dc946b4feb7fbd512082382
font_02_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1