Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cce3b02d2c037db…

MALICIOUS

PDF

73.6 KB Created: 2021-09-27 14:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f2440af0d99ba3df4b01b3c2a89ac93 SHA-1: 5151bc1870481b71e0b642ee47011d636e2cbe83 SHA-256: 9cce3b02d2c037dba487cd01454c3cc44dcc5143a67aa0b1d734289b12ffeef4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for users to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=download+free+fire+max+2021 PDF link annotation
    • https://ikorti-iao.com/userfiles/files/wojikegidejiwifogi.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/jodutovafag.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1632309433.pdfIn PDF document text
    • http://vaynhe.com/upload/files/12851560014.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/toselupedakazekive.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/sf89cujlo49fqur243rug5cej1/40309781887.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/97390178162.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/98146868146.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vb0l4rgc1do4cu7d45dk0tace3/vomafik.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/49653327226.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/4270171185.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/55124517852.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/24061127889.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109100759383245.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/50tflargdip7d11nh7ue3rludd/xetulirabewas.pdfIn PDF document text
    • http://taigesw.com/upload/files/vodunizovajigalini.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/xebikugevadisume.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/guzomizizitofidawopi.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/pinowobewikivososilepo.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210920184638.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/joraf.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/lajevarabimusunu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/41783486652.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/79289357807.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210915/16316903526060.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_off0000b8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DE 10732 bytes
SHA-256: 2aca45ecd3ebd3a392a8028d3c691b0e78ef49599a793a85016a0715824fb7ee
font_01_sfnt_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 18108 bytes
SHA-256: 401cd6813c8c1956db58f43e0ad4a4c9eb51705fed071965a0c8edf78f057493
font_02_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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