Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cefb4735d253a8…

MALICIOUS

PDF

77.1 KB Created: 2021-09-21 02:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2864e36aba3a87d03726d9f060fef6f SHA-1: 3fd896d09a3d972a01de5eef65668cbee2f7a7e4 SHA-256: 87cefb4735d253a81fbc381c03a54cd0648af56330365421bccf29e31ac8d60c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites for phishing or malware downloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=mini+militia+mini+military PDF link annotation
    • http://filipdegreef.be/uploads/files/zilura.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/84223835846.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/81719721228.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/30898598767.pdfIn PDF document text
    • https://ikansambel.com/contents/files/82822383016.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/losivexakipod.pdfIn PDF document text
    • http://modero.vn/upload/files/44866060655.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a0fd9959f---bamazowitobiwaxafobalilep.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/takubajar.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133788016756---98341414930.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161454f4d27f73---saporalivigisud.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/liwawijitetozaloranebu.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/dopajokumam.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143eafa0fef0---lalivekoxozevuvajawotuxet.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/kamoji.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/sibiwidikix.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/savadiwabipabozisobirus.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/jimural.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe10ad0604---sasojogiralo.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/17502941107.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/pitalisuzuteki.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/4709112696.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/golikix.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_off0000c8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 18796 bytes
SHA-256: 3c35066e5d51a9db2ea14e618953e3d630b4de75be952e0995fb848df2fb93e7
font_02_sfnt_off0001115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115E 9956 bytes
SHA-256: e402f4a6c7938321dcdf28445e1295fb8a542d0735673d0daf8ce34334ad9d60

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