Malicious PDF — malware analysis report

Static analysis result for SHA-256 540811cc8fd92ff8…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 07:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ccfe79cf211410223baa9eb3e17e0abf SHA-1: 03497c2f2f1dca3410d298423836e64b3609f7da SHA-256: 540811cc8fd92ff82a251446ed90f651fc856ce0dd5e6c2ba8972f8382d76505
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. This suggests a phishing or redirection scheme designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://doks-films.com/pcms/content/file/13954220412.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160742f75a9fee---tatezugi.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/50569803277.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/xuwalabi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/5lkm2biguebo1uv3euge0i8afq/jupakajofedorapuwezojuba.pdfIn PDF document text
    • https://toocapen.com/files/86767278701.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/gerezuwuridowadafibaxo.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a3557e72c998c234602c8e61d8d8f8b9/21496813958.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160903f5137ca2---bagegadi.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/59261997202.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082b19509e6e---34272432789.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/dedifaxoxatapubulalafadom.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/48873729322.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9b58a276e---xidijogigisimaduku.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429104224256108.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/67043797549.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/2cc8k6vrsap3tu49l1fvuuu3h7/76870537674.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/215f51d1af76939b84a2019df7b46a5c/zulovadotusesolezewapefe.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0731c97dca3d913331c9a5c1e549a0a6/wuvonuwuge.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160aadbd3dc1fd---81919358756.pdfIn PDF document text
    • https://samtee.com/admin/images/file/kezijavopaxidivinaxepif.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e2556f242230c5a7fd1e8f94c1cfdb82/49599631479.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/91032957713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vray+for+sketchup+2019+mac+crackPDF 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_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 11240 bytes
SHA-256: 20b77f2f5912a14bbc1345a1f108110259ed5d489e192935b835b2f079753d2c
font_02_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 17300 bytes
SHA-256: 31cf4903e8e537f9bca01ec8b9b81cc8be67507cf54fc44a4d6bac4958139718