Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce31fd8c56fdf7e0…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 06:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be88cc3b144e3d97724d0b9384b91abc SHA-1: 958717499cf3867110c56b3b297fca03ac194b67 SHA-256: ce31fd8c56fdf7e040aac8e690aceab22a40063eb291b36dcb1995f3ac2ab393
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://clickbox.ro/images/file/41224506185.pdf In PDF document text
    • http://deeringbayrealestate.com/userfiles/files/63287084072.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/dofovuba.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/jasajugofukixifixativi.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/85522639379.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/68185350359.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/73353135576.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/39523143899.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/balevixasatabefuxasuze.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/dumevasakipatakifaj.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/libinugi.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/58938343663.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/72420953199.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/44781210907.pdfIn PDF document text
    • http://limoride.net/gallery/file/15124944502.pdfIn PDF document text
    • http://vecsecity.info/editor_up/tavexepigikugewonuwag.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130faa523866---waxerixogaral.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613337d1a6a14---nipuvuzobujinir.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/mepisumi.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/zidipisinigosejifitenot.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a3804aa27---70526512946.pdfIn PDF document text
    • http://chipgene.com/image/files/20210909_150306.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tofuxonawipepovolu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363b362fcdf---nunikesixexupakuw.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/gipedewadudelipulox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+car+games+offlinePDF 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_off0000cb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4F 10556 bytes
SHA-256: 50443a00d7affa6d9a8ad0a0d25dd8ec8f532aea5a507d0f96517fceb7c9e993
font_01_sfnt_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 16896 bytes
SHA-256: 89becf20fef2439d9dcfc526cfdcf42ac270ae694807808c8011c48f8586a12c
font_02_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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